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NMAP(1)                      Nmap Reference Guide                      NMAP(1)

       nmap - Network exploration tool and security / port scanner

       nmap [Scan Type...] [Options] {target specification}

       Nmap ("Network Mapper") is an open source tool for network exploration and security auditing. It was designed
       to rapidly scan large networks, although it works fine against single hosts. Nmap uses raw IP packets in novel
       ways to determine what hosts are available on the network, what services (application name and version) those
       hosts are offering, what operating systems (and OS versions) they are running, what type of packet
       filters/firewalls are in use, and dozens of other characteristics. While Nmap is commonly used for security
       audits, many systems and network administrators find it useful for routine tasks such as network inventory,
       managing service upgrade schedules, and monitoring host or service uptime.

       The output from Nmap is a list of scanned targets, with supplemental information on each depending on the
       options used. Key among that information is the "interesting ports table"..  That table lists the port number
       and protocol, service name, and state. The state is either open, filtered, closed, or unfiltered.  Open.  means
       that an application on the target machine is listening for connections/packets on that port.  Filtered.  means
       that a firewall, filter, or other network obstacle is blocking the port so that Nmap cannot tell whether it is
       open or closed.  Closed.  ports have no application listening on them, though they could open up at any time.
       Ports are classified as unfiltered.  when they are responsive to Nmap's probes, but Nmap cannot determine
       whether they are open or closed. Nmap reports the state combinations open|filtered.  and closed|filtered.  when
       it cannot determine which of the two states describe a port. The port table may also include software version
       details when version detection has been requested. When an IP protocol scan is requested (-sO), Nmap provides
       information on supported IP protocols rather than listening ports.

       In addition to the interesting ports table, Nmap can provide further information on targets, including reverse
       DNS names, operating system guesses, device types, and MAC addresses.

       A typical Nmap scan is shown in Example 1. The only Nmap arguments used in this example are -A, to enable OS
       and version detection, script scanning, and traceroute; -T4 for faster execution; and then the two target

       Example 1. A representative Nmap scan

           # nmap -A -T4

           Nmap scan report for (
           Host is up (0.045s latency).
           Not shown: 993 filtered ports
           22/tcp    open   ssh     OpenSSH 4.3 (protocol 2.0)
           | ssh-hostkey: 1024 60:ac:4d:51:b1:cd:85:09:12:16:92:76:1d:5d:27:6e (DSA)
           |_2048 2c:22:75:60:4b:c3:3b:18:a2:97:2c:96:7e:28:dc:dd (RSA)
           25/tcp    closed smtp
           53/tcp    open   domain
           70/tcp    closed gopher
           80/tcp    open   http    Apache httpd 2.2.3 ((CentOS))
           |_html-title: Go ahead and ScanMe!
           | http-methods: Potentially risky methods: TRACE
           113/tcp   closed auth
           31337/tcp closed Elite
           Device type: general purpose
           Running: Linux 2.6.X
           OS details: Linux 2.6.13 - 2.6.31, Linux 2.6.18
           Network Distance: 13 hops

           TRACEROUTE (using port 80/tcp)
           HOP RTT       ADDRESS
           [Cut first 10 hops for brevity]
           11  80.33 ms (
           12  137.52 ms (
           13  44.15 ms (

           Nmap done: 1 IP address (1 host up) scanned in 22.19 seconds

       The newest version of Nmap can be obtained from The newest version of this man page is
       available at  It is also included as a chapter of Nmap Network Scanning: The
       Official Nmap Project Guide to Network Discovery and Security Scanning (see

       This options summary is printed when Nmap is run with no arguments, and the latest version is always available
       at It helps people remember the most common options, but is no substitute
       for the in-depth documentation in the rest of this manual. Some obscure options aren't even included here.

           Nmap 5.51.6 ( )
           Usage: nmap [Scan Type(s)] [Options] {target specification}
             Can pass hostnames, IP addresses, networks, etc.
             Ex:,,; 10.0.0-255.1-254
             -iL <inputfilename>: Input from list of hosts/networks
             -iR <num hosts>: Choose random targets
             --exclude <host1[,host2][,host3],...>: Exclude hosts/networks
             --excludefile <exclude_file>: Exclude list from file
           HOST DISCOVERY:
             -sL: List Scan - simply list targets to scan
             -sn: Ping Scan - disable port scan
             -Pn: Treat all hosts as online -- skip host discovery
             -PS/PA/PU/PY[portlist]: TCP SYN/ACK, UDP or SCTP discovery to given ports
             -PE/PP/PM: ICMP echo, timestamp, and netmask request discovery probes
             -PO[protocol list]: IP Protocol Ping
             -n/-R: Never do DNS resolution/Always resolve [default: sometimes]
             --dns-servers <serv1[,serv2],...>: Specify custom DNS servers
             --system-dns: Use OS's DNS resolver
             --traceroute: Trace hop path to each host
             -sS/sT/sA/sW/sM: TCP SYN/Connect()/ACK/Window/Maimon scans
             -sU: UDP Scan
             -sN/sF/sX: TCP Null, FIN, and Xmas scans
             --scanflags <flags>: Customize TCP scan flags
             -sI <zombie host[:probeport]>: Idle scan
             -sY/sZ: SCTP INIT/COOKIE-ECHO scans
             -sO: IP protocol scan
             -b <FTP relay host>: FTP bounce scan
             -p <port ranges>: Only scan specified ports
               Ex: -p22; -p1-65535; -p U:53,111,137,T:21-25,80,139,8080,S:9
             -F: Fast mode - Scan fewer ports than the default scan
             -r: Scan ports consecutively - don't randomize
             --top-ports <number>: Scan <number> most common ports
             --port-ratio <ratio>: Scan ports more common than <ratio>
             -sV: Probe open ports to determine service/version info
             --version-intensity <level>: Set from 0 (light) to 9 (try all probes)
             --version-light: Limit to most likely probes (intensity 2)
             --version-all: Try every single probe (intensity 9)
             --version-trace: Show detailed version scan activity (for debugging)
           SCRIPT SCAN:
             -sC: equivalent to --script=default
             --script=<Lua scripts>: <Lua scripts> is a comma separated list of
                      directories, script-files or script-categories
             --script-args=<n1=v1,[n2=v2,...]>: provide arguments to scripts
             --script-trace: Show all data sent and received
             --script-updatedb: Update the script database.
           OS DETECTION:
             -O: Enable OS detection
             --osscan-limit: Limit OS detection to promising targets
             --osscan-guess: Guess OS more aggressively
             Options which take <time> are in seconds, or append 'ms' (milliseconds),
             's' (seconds), 'm' (minutes), or 'h' (hours) to the value (e.g. 30m).
             -T<0-5>: Set timing template (higher is faster)
             --min-hostgroup/max-hostgroup <size>: Parallel host scan group sizes
             --min-parallelism/max-parallelism <numprobes>: Probe parallelization
             --min-rtt-timeout/max-rtt-timeout/initial-rtt-timeout <time>: Specifies
                 probe round trip time.
             --max-retries <tries>: Caps number of port scan probe retransmissions.
             --host-timeout <time>: Give up on target after this long
             --scan-delay/--max-scan-delay <time>: Adjust delay between probes
             --min-rate <number>: Send packets no slower than <number> per second
             --max-rate <number>: Send packets no faster than <number> per second
             -f; --mtu <val>: fragment packets (optionally w/given MTU)
             -D <decoy1,decoy2[,ME],...>: Cloak a scan with decoys
             -S <IP_Address>: Spoof source address
             -e <iface>: Use specified interface
             -g/--source-port <portnum>: Use given port number
             --data-length <num>: Append random data to sent packets
             --ip-options <options>: Send packets with specified ip options
             --ttl <val>: Set IP time-to-live field
             --spoof-mac <mac address/prefix/vendor name>: Spoof your MAC address
             --badsum: Send packets with a bogus TCP/UDP/SCTP checksum
             -oN/-oX/-oS/-oG <file>: Output scan in normal, XML, s|<rIpt kIddi3,
                and Grepable format, respectively, to the given filename.
             -oA <basename>: Output in the three major formats at once
             -v: Increase verbosity level (use -vv or more for greater effect)
             -d: Increase debugging level (use -dd or more for greater effect)
             --reason: Display the reason a port is in a particular state
             --open: Only show open (or possibly open) ports
             --packet-trace: Show all packets sent and received
             --iflist: Print host interfaces and routes (for debugging)
             --log-errors: Log errors/warnings to the normal-format output file
             --append-output: Append to rather than clobber specified output files
             --resume <filename>: Resume an aborted scan
             --stylesheet <path/URL>: XSL stylesheet to transform XML output to HTML
             --webxml: Reference stylesheet from Nmap.Org for more portable XML
             --no-stylesheet: Prevent associating of XSL stylesheet w/XML output
             -6: Enable IPv6 scanning
             -A: Enable OS detection, version detection, script scanning, and traceroute
             --datadir <dirname>: Specify custom Nmap data file location
             --send-eth/--send-ip: Send using raw ethernet frames or IP packets
             --privileged: Assume that the user is fully privileged
             --unprivileged: Assume the user lacks raw socket privileges
             -V: Print version number
             -h: Print this help summary page.
             nmap -v -A
             nmap -v -sn
             nmap -v -iR 10000 -Pn -p 80

       Everything on the Nmap command-line that isn't an option (or option argument) is treated as a target host
       specification. The simplest case is to specify a target IP address or hostname for scanning.

       Sometimes you wish to scan a whole network of adjacent hosts. For this, Nmap supports CIDR-style.  addressing.
       You can append /numbits to an IPv4 address or hostname and Nmap will scan every IP address for which the first
       numbits are the same as for the reference IP or hostname given. For example, would scan the 256
       hosts between (binary: 11000000 10101000 00001010 00000000) and (binary: 11000000
       10101000 00001010 11111111), inclusive. would scan exactly the same targets. Given that the
       host  is at the IP address, the specification would scan the
       65,536 IP addresses between and The smallest allowed value is /0, which targets the
       whole Internet. The largest value is /32, which scans just the named host or IP address because all address
       bits are fixed.

       CIDR notation is short but not always flexible enough. For example, you might want to scan but
       skip any IPs ending with .0 or .255 because they may be used as subnet network and broadcast addresses. Nmap
       supports this through octet range addressing. Rather than specify a normal IP address, you can specify a
       comma-separated list of numbers or ranges for each octet. For example, 192.168.0-255.1-254 will skip all
       addresses in the range that end in .0 or .255, and 192.168.3-5,7.1 will scan the four addresses,,, and Either side of a range may be omitted; the default values are 0 on
       the left and 255 on the right. Using - by itself is the same as 0-255, but remember to use 0- in the first
       octet so the target specification doesn't look like a command-line option. Ranges need not be limited to the
       final octets: the specifier 0-255.0-255.13.37 will perform an Internet-wide scan for all IP addresses ending in
       13.37. This sort of broad sampling can be useful for Internet surveys and research.

       IPv6 addresses can only be specified by their fully qualified IPv6 address or hostname. CIDR and octet ranges
       aren't supported for IPv6 because they are rarely useful.

       Nmap accepts multiple host specifications on the command line, and they don't need to be the same type. The
       command nmap 10.0.0,1,3-7.- does what you would expect.

       While targets are usually specified on the command lines, the following options are also available to control
       target selection:

       -iL inputfilename (Input from list) .
           Reads target specifications from inputfilename. Passing a huge list of hosts is often awkward on the
           command line, yet it is a common desire. For example, your DHCP server might export a list of 10,000
           current leases that you wish to scan. Or maybe you want to scan all IP addresses except for those to locate
           hosts using unauthorized static IP addresses. Simply generate the list of hosts to scan and pass that
           filename to Nmap as an argument to the -iL option. Entries can be in any of the formats accepted by Nmap on
           the command line (IP address, hostname, CIDR, IPv6, or octet ranges). Each entry must be separated by one
           or more spaces, tabs, or newlines. You can specify a hyphen (-) as the filename if you want Nmap to read
           hosts from standard input rather than an actual file.

           The input file may contain comments that start with # and extend to the end of the line.

       -iR num hosts (Choose random targets) .
           For Internet-wide surveys and other research, you may want to choose targets at random. The num hosts
           argument tells Nmap how many IPs to generate. Undesirable IPs such as those in certain private, multicast,
           or unallocated address ranges are automatically skipped. The argument 0 can be specified for a never-ending
           scan. Keep in mind that some network administrators bristle at unauthorized scans of their networks and may
           complain. Use this option at your own risk! If you find yourself really bored one rainy afternoon, try the
           command nmap -Pn -sS -p 80 -iR 0 --open.  to locate random web servers for browsing.

       --exclude host1[,host2[,...]] (Exclude hosts/networks) .
           Specifies a comma-separated list of targets to be excluded from the scan even if they are part of the
           overall network range you specify. The list you pass in uses normal Nmap syntax, so it can include
           hostnames, CIDR netblocks, octet ranges, etc. This can be useful when the network you wish to scan includes
           untouchable mission-critical servers, systems that are known to react adversely to port scans, or subnets
           administered by other people.

       --excludefile exclude_file (Exclude list from file) .
           This offers the same functionality as the --exclude option, except that the excluded targets are provided
           in a newline-, space-, or tab-delimited exclude_file rather than on the command line.

           The exclude file may contain comments that start with # and extend to the end of the line.

       One of the very first steps in any network reconnaissance mission is to reduce a (sometimes huge) set of IP
       ranges into a list of active or interesting hosts. Scanning every port of every single IP address is slow and
       usually unnecessary. Of course what makes a host interesting depends greatly on the scan purposes. Network
       administrators may only be interested in hosts running a certain service, while security auditors may care
       about every single device with an IP address. An administrator may be comfortable using just an ICMP ping to
       locate hosts on his internal network, while an external penetration tester may use a diverse set of dozens of
       probes in an attempt to evade firewall restrictions.

       Because host discovery needs are so diverse, Nmap offers a wide variety of options for customizing the
       techniques used. Host discovery is sometimes called ping scan, but it goes well beyond the simple ICMP echo
       request packets associated with the ubiquitous ping tool. Users can skip the ping step entirely with a list
       scan (-sL) or by disabling ping (-Pn), or engage the network with arbitrary combinations of multi-port TCP
       SYN/ACK, UDP, SCTP INIT and ICMP probes. The goal of these probes is to solicit responses which demonstrate
       that an IP address is actually active (is being used by a host or network device). On many networks, only a
       small percentage of IP addresses are active at any given time. This is particularly common with private address
       space such as That network has 16 million IPs, but I have seen it used by companies with less than
       a thousand machines. Host discovery can find those machines in a sparsely allocated sea of IP addresses.

       If no host discovery options are given, Nmap sends an ICMP echo request, a TCP SYN packet to port 443, a TCP
       ACK packet to port 80, and an ICMP timestamp request. These defaults are equivalent to the -PE -PS443 -PA80 -PP
       options. An exception to this is that an ARP scan is used for any targets which are on a local ethernet
       network. For unprivileged Unix shell users, the default probes are a SYN packet to ports 80 and 443 using the
       connect system call..  This host discovery is often sufficient when scanning local networks, but a more
       comprehensive set of discovery probes is recommended for security auditing.

       The -P* options (which select ping types) can be combined. You can increase your odds of penetrating strict
       firewalls by sending many probe types using different TCP ports/flags and ICMP codes. Also note that ARP
       discovery (-PR).  is done by default against targets on a local ethernet network even if you specify other -P*
       options, because it is almost always faster and more effective.

       By default, Nmap does host discovery and then performs a port scan against each host it determines is online.
       This is true even if you specify non-default host discovery types such as UDP probes (-PU). Read about the -sn
       option to learn how to perform only host discovery, or use -Pn to skip host discovery and port scan all target
       hosts. The following options control host discovery:

       -sL (List Scan) .
           The list scan is a degenerate form of host discovery that simply lists each host of the network(s)
           specified, without sending any packets to the target hosts. By default, Nmap still does reverse-DNS
           resolution on the hosts to learn their names. It is often surprising how much useful information simple
           hostnames give out. For example, fw.chi is the name of one company's Chicago firewall.  Nmap also reports
           the total number of IP addresses at the end. The list scan is a good sanity check to ensure that you have
           proper IP addresses for your targets. If the hosts sport domain names you do not recognize, it is worth
           investigating further to prevent scanning the wrong company's network.

           Since the idea is to simply print a list of target hosts, options for higher level functionality such as
           port scanning, OS detection, or ping scanning cannot be combined with this. If you wish to disable ping
           scanning while still performing such higher level functionality, read up on the -Pn (skip ping) option.

       -sn (No port scan) .
           This option tells Nmap not to do a port scan after host discovery, and only print out the available hosts
           that responded to the scan. This is often known as a "ping scan", but you can also request that traceroute
           and NSE host scripts be run. This is by default one step more intrusive than the list scan, and can often
           be used for the same purposes. It allows light reconnaissance of a target network without attracting much
           attention. Knowing how many hosts are up is more valuable to attackers than the list provided by list scan
           of every single IP and host name.

           Systems administrators often find this option valuable as well. It can easily be used to count available
           machines on a network or monitor server availability. This is often called a ping sweep, and is more
           reliable than pinging the broadcast address because many hosts do not reply to broadcast queries.

           The default host discovery done with -sn consists of an ICMP echo request, TCP SYN to port 443, TCP ACK to
           port 80, and an ICMP timestamp request by default. When executed by an unprivileged user, only SYN packets
           are sent (using a connect call) to ports 80 and 443 on the target. When a privileged user tries to scan
           targets on a local ethernet network, ARP requests are used unless --send-ip was specified. The -sn option
           can be combined with any of the discovery probe types (the -P* options, excluding -Pn) for greater
           flexibility. If any of those probe type and port number options are used, the default probes are
           overridden. When strict firewalls are in place between the source host running Nmap and the target network,
           using those advanced techniques is recommended. Otherwise hosts could be missed when the firewall drops
           probes or their responses.

           In previous releases of Nmap, -sn was known as -sP..

       -Pn (No ping) .
           This option skips the Nmap discovery stage altogether. Normally, Nmap uses this stage to determine active
           machines for heavier scanning. By default, Nmap only performs heavy probing such as port scans, version
           detection, or OS detection against hosts that are found to be up. Disabling host discovery with -Pn causes
           Nmap to attempt the requested scanning functions against every target IP address specified. So if a class B
           target address space (/16) is specified on the command line, all 65,536 IP addresses are scanned. Proper
           host discovery is skipped as with the list scan, but instead of stopping and printing the target list, Nmap
           continues to perform requested functions as if each target IP is active. To skip ping scan and port scan,
           while still allowing NSE to run, use the two options -Pn -sn together.

           For machines on a local ethernet network, ARP scanning will still be performed (unless --send-ip is
           specified) because Nmap needs MAC addresses to further scan target hosts. In previous versions of Nmap, -Pn
           was -P0.  and -PN..

       -PS port list (TCP SYN Ping) .
           This option sends an empty TCP packet with the SYN flag set. The default destination port is 80
           (configurable at compile time by changing DEFAULT_TCP_PROBE_PORT_SPEC.  in nmap.h)..  Alternate ports can
           be specified as a parameter. The syntax is the same as for the -p except that port type specifiers like T:
           are not allowed. Examples are -PS22 and -PS22-25,80,113,1050,35000. Note that there can be no space between
           -PS and the port list. If multiple probes are specified they will be sent in parallel.

           The SYN flag suggests to the remote system that you are attempting to establish a connection. Normally the
           destination port will be closed, and a RST (reset) packet sent back. If the port happens to be open, the
           target will take the second step of a TCP three-way-handshake.  by responding with a SYN/ACK TCP packet.
           The machine running Nmap then tears down the nascent connection by responding with a RST rather than
           sending an ACK packet which would complete the three-way-handshake and establish a full connection. The RST
           packet is sent by the kernel of the machine running Nmap in response to the unexpected SYN/ACK, not by Nmap

           Nmap does not care whether the port is open or closed. Either the RST or SYN/ACK response discussed
           previously tell Nmap that the host is available and responsive.

           On Unix boxes, only the privileged user root.  is generally able to send and receive raw TCP packets..  For
           unprivileged users, a workaround is automatically employed.  whereby the connect system call is initiated
           against each target port. This has the effect of sending a SYN packet to the target host, in an attempt to
           establish a connection. If connect returns with a quick success or an ECONNREFUSED failure, the underlying
           TCP stack must have received a SYN/ACK or RST and the host is marked available. If the connection attempt
           is left hanging until a timeout is reached, the host is marked as down. This workaround is also used for
           IPv6 connections, as raw IPv6 packet building support is not yet available in Nmap..

       -PA port list (TCP ACK Ping) .
           The TCP ACK ping is quite similar to the just-discussed SYN ping. The difference, as you could likely
           guess, is that the TCP ACK flag is set instead of the SYN flag. Such an ACK packet purports to be
           acknowledging data over an established TCP connection, but no such connection exists. So remote hosts
           should always respond with a RST packet, disclosing their existence in the process.

           The -PA option uses the same default port as the SYN probe (80) and can also take a list of destination
           ports in the same format. If an unprivileged user tries this, or an IPv6 target is specified, the connect
           workaround discussed previously is used. This workaround is imperfect because connect is actually sending a
           SYN packet rather than an ACK.

           The reason for offering both SYN and ACK ping probes is to maximize the chances of bypassing firewalls.
           Many administrators configure routers and other simple firewalls to block incoming SYN packets except for
           those destined for public services like the company web site or mail server. This prevents other incoming
           connections to the organization, while allowing users to make unobstructed outgoing connections to the
           Internet. This non-stateful approach takes up few resources on the firewall/router and is widely supported
           by hardware and software filters. The Linux Netfilter/iptables.  firewall software offers the --syn
           convenience option to implement this stateless approach. When stateless firewall rules such as this are in
           place, SYN ping probes (-PS) are likely to be blocked when sent to closed target ports. In such cases, the
           ACK probe shines as it cuts right through these rules.

           Another common type of firewall uses stateful rules that drop unexpected packets. This feature was
           initially found mostly on high-end firewalls, though it has become much more common over the years. The
           Linux Netfilter/iptables system supports this through the --state option, which categorizes packets based
           on connection state. A SYN probe is more likely to work against such a system, as unexpected ACK packets
           are generally recognized as bogus and dropped. A solution to this quandary is to send both SYN and ACK
           probes by specifying -PS and -PA.

       -PU port list (UDP Ping) .
           Another host discovery option is the UDP ping, which sends a UDP packet to the given ports. For most ports,
           the packet will be empty, though for a few a protocol-specific payload will be sent that is more likely to
           get a response..  The payload database is described at

           The --data-length.  option sends a fixed-length random payload for all ports.

           The port list takes the same format as with the previously discussed -PS and -PA options. If no ports are
           specified, the default is 40125..  This default can be configured at compile-time by changing
           DEFAULT_UDP_PROBE_PORT_SPEC.  in nmap.h..  A highly uncommon port is used by default because sending to
           open ports is often undesirable for this particular scan type.

           Upon hitting a closed port on the target machine, the UDP probe should elicit an ICMP port unreachable
           packet in return. This signifies to Nmap that the machine is up and available. Many other types of ICMP
           errors, such as host/network unreachables or TTL exceeded are indicative of a down or unreachable host. A
           lack of response is also interpreted this way. If an open port is reached, most services simply ignore the
           empty packet and fail to return any response. This is why the default probe port is 40125, which is highly
           unlikely to be in use. A few services, such as the Character Generator (chargen) protocol, will respond to
           an empty UDP packet, and thus disclose to Nmap that the machine is available.

           The primary advantage of this scan type is that it bypasses firewalls and filters that only screen TCP. For
           example, I once owned a Linksys BEFW11S4 wireless broadband router. The external interface of this device
           filtered all TCP ports by default, but UDP probes would still elicit port unreachable messages and thus
           give away the device.

       -PY port list (SCTP INIT Ping) .
           This option sends an SCTP packet containing a minimal INIT chunk. The default destination port is 80
           (configurable at compile time by changing DEFAULT_SCTP_PROBE_PORT_SPEC.  in nmap.h). Alternate ports can be
           specified as a parameter. The syntax is the same as for the -p except that port type specifiers like S: are
           not allowed. Examples are -PY22 and -PY22,80,179,5060. Note that there can be no space between -PY and the
           port list. If multiple probes are specified they will be sent in parallel.

           The INIT chunk suggests to the remote system that you are attempting to establish an association. Normally
           the destination port will be closed, and an ABORT chunk will be sent back. If the port happens to be open,
           the target will take the second step of an SCTP four-way-handshake.  by responding with an INIT-ACK chunk.
           If the machine running Nmap has a functional SCTP stack, then it tears down the nascent association by
           responding with an ABORT chunk rather than sending a COOKIE-ECHO chunk which would be the next step in the
           four-way-handshake. The ABORT packet is sent by the kernel of the machine running Nmap in response to the
           unexpected INIT-ACK, not by Nmap itself.

           Nmap does not care whether the port is open or closed. Either the ABORT or INIT-ACK response discussed
           previously tell Nmap that the host is available and responsive.

           On Unix boxes, only the privileged user root.  is generally able to send and receive raw SCTP packets..
           Using SCTP INIT Pings is currently not possible for unprivileged users..  The same limitation applies to
           IPv6, which is currently not supported for SCTP INIT Ping..

       -PE; -PP; -PM (ICMP Ping Types) .
           In addition to the unusual TCP, UDP and SCTP host discovery types discussed previously, Nmap can send the
           standard packets sent by the ubiquitous ping program. Nmap sends an ICMP type 8 (echo request) packet to
           the target IP addresses, expecting a type 0 (echo reply) in return from available hosts..  Unfortunately
           for network explorers, many hosts and firewalls now block these packets, rather than responding as required
           by RFC 1122[2]..  For this reason, ICMP-only scans are rarely reliable enough against unknown targets over
           the Internet. But for system administrators monitoring an internal network, they can be a practical and
           efficient approach. Use the -PE option to enable this echo request behavior.

           While echo request is the standard ICMP ping query, Nmap does not stop there. The ICMP standards (RFC
           792[3].  and RFC 950[4].  "a host SHOULD NOT implement these messages". Timestamp and address mask queries
           can be sent with the -PP and -PM options, respectively. A timestamp reply (ICMP code 14) or address mask
           reply (code 18) discloses that the host is available. These two queries can be valuable when administrators
           specifically block echo request packets while forgetting that other ICMP queries can be used for the same

       -PO protocol list (IP Protocol Ping) .
           One of the newer host discovery options is the IP protocol ping, which sends IP packets with the specified
           protocol number set in their IP header. The protocol list takes the same format as do port lists in the
           previously discussed TCP, UDP and SCTP host discovery options. If no protocols are specified, the default
           is to send multiple IP packets for ICMP (protocol 1), IGMP (protocol 2), and IP-in-IP (protocol 4). The
           default protocols can be configured at compile-time by changing DEFAULT_PROTO_PROBE_PORT_SPEC.  in nmap.h.
           Note that for the ICMP, IGMP, TCP (protocol 6), UDP (protocol 17) and SCTP (protocol 132), the packets are
           sent with the proper protocol headers.  while other protocols are sent with no additional data beyond the
           IP header (unless the --data-length.  option is specified).

           This host discovery method looks for either responses using the same protocol as a probe, or ICMP protocol
           unreachable messages which signify that the given protocol isn't supported on the destination host. Either
           type of response signifies that the target host is alive.

       -PR (ARP Ping) .
           One of the most common Nmap usage scenarios is to scan an ethernet LAN. On most LANs, especially those
           using private address ranges specified by RFC 1918[5], the vast majority of IP addresses are unused at any
           given time. When Nmap tries to send a raw IP packet such as an ICMP echo request, the operating system must
           determine the destination hardware (ARP) address corresponding to the target IP so that it can properly
           address the ethernet frame. This is often slow and problematic, since operating systems weren't written
           with the expectation that they would need to do millions of ARP requests against unavailable hosts in a
           short time period.

           ARP scan puts Nmap and its optimized algorithms in charge of ARP requests. And if it gets a response back,
           Nmap doesn't even need to worry about the IP-based ping packets since it already knows the host is up. This
           makes ARP scan much faster and more reliable than IP-based scans. So it is done by default when scanning
           ethernet hosts that Nmap detects are on a local ethernet network. Even if different ping types (such as -PE
           or -PS) are specified, Nmap uses ARP instead for any of the targets which are on the same LAN. If you
           absolutely don't want to do an ARP scan, specify --send-ip.

       --traceroute (Trace path to host) .
           Traceroutes are performed post-scan using information from the scan results to determine the port and
           protocol most likely to reach the target. It works with all scan types except connect scans (-sT) and idle
           scans (-sI). All traces use Nmap's dynamic timing model and are performed in parallel.

           Traceroute works by sending packets with a low TTL (time-to-live) in an attempt to elicit ICMP Time
           Exceeded messages from intermediate hops between the scanner and the target host. Standard traceroute
           implementations start with a TTL of 1 and increment the TTL until the destination host is reached. Nmap's
           traceroute starts with a high TTL and then decrements the TTL until it reaches zero. Doing it backwards
           lets Nmap employ clever caching algorithms to speed up traces over multiple hosts. On average Nmap sends
           5-10 fewer packets per host, depending on network conditions. If a single subnet is being scanned (i.e.
  Nmap may only have to send two packets to most hosts.

       -n (No DNS resolution) .
           Tells Nmap to never do reverse DNS resolution on the active IP addresses it finds. Since DNS can be slow
           even with Nmap's built-in parallel stub resolver, this option can slash scanning times.

       -R (DNS resolution for all targets) .
           Tells Nmap to always do reverse DNS resolution on the target IP addresses. Normally reverse DNS is only
           performed against responsive (online) hosts.

       --system-dns (Use system DNS resolver) .
           By default, Nmap resolves IP addresses by sending queries directly to the name servers configured on your
           host and then listening for responses. Many requests (often dozens) are performed in parallel to improve
           performance. Specify this option to use your system resolver instead (one IP at a time via the getnameinfo
           call). This is slower and rarely useful unless you find a bug in the Nmap parallel resolver (please let us
           know if you do). The system resolver is always used for IPv6 scans.

       --dns-servers server1[,server2[,...]]  (Servers to use for reverse DNS queries) .
           By default, Nmap determines your DNS servers (for rDNS resolution) from your resolv.conf file (Unix) or the
           Registry (Win32). Alternatively, you may use this option to specify alternate servers. This option is not
           honored if you are using --system-dns or an IPv6 scan. Using multiple DNS servers is often faster,
           especially if you choose authoritative servers for your target IP space. This option can also improve
           stealth, as your requests can be bounced off just about any recursive DNS server on the Internet.

           This option also comes in handy when scanning private networks. Sometimes only a few name servers provide
           proper rDNS information, and you may not even know where they are. You can scan the network for port 53
           (perhaps with version detection), then try Nmap list scans (-sL) specifying each name server one at a time
           with --dns-servers until you find one which works.

       While Nmap has grown in functionality over the years, it began as an efficient port scanner, and that remains
       its core function. The simple command nmap target scans 1,000 TCP ports on the host target. While many port
       scanners have traditionally lumped all ports into the open or closed states, Nmap is much more granular. It
       divides ports into six states: open, closed, filtered, unfiltered, open|filtered, or closed|filtered.

       These states are not intrinsic properties of the port itself, but describe how Nmap sees them. For example, an
       Nmap scan from the same network as the target may show port 135/tcp as open, while a scan at the same time with
       the same options from across the Internet might show that port as filtered.

       The six port states recognized by Nmap

           An application is actively accepting TCP connections, UDP datagrams or SCTP associations on this port.
           Finding these is often the primary goal of port scanning. Security-minded people know that each open port
           is an avenue for attack. Attackers and pen-testers want to exploit the open ports, while administrators try
           to close or protect them with firewalls without thwarting legitimate users. Open ports are also interesting
           for non-security scans because they show services available for use on the network.

           A closed port is accessible (it receives and responds to Nmap probe packets), but there is no application
           listening on it. They can be helpful in showing that a host is up on an IP address (host discovery, or ping
           scanning), and as part of OS detection. Because closed ports are reachable, it may be worth scanning later
           in case some open up. Administrators may want to consider blocking such ports with a firewall. Then they
           would appear in the filtered state, discussed next.

           Nmap cannot determine whether the port is open because packet filtering prevents its probes from reaching
           the port. The filtering could be from a dedicated firewall device, router rules, or host-based firewall
           software. These ports frustrate attackers because they provide so little information. Sometimes they
           respond with ICMP error messages such as type 3 code 13 (destination unreachable: communication
           administratively prohibited), but filters that simply drop probes without responding are far more common.
           This forces Nmap to retry several times just in case the probe was dropped due to network congestion rather
           than filtering. This slows down the scan dramatically.

           The unfiltered state means that a port is accessible, but Nmap is unable to determine whether it is open or
           closed. Only the ACK scan, which is used to map firewall rulesets, classifies ports into this state.
           Scanning unfiltered ports with other scan types such as Window scan, SYN scan, or FIN scan, may help
           resolve whether the port is open.

           Nmap places ports in this state when it is unable to determine whether a port is open or filtered. This
           occurs for scan types in which open ports give no response. The lack of response could also mean that a
           packet filter dropped the probe or any response it elicited. So Nmap does not know for sure whether the
           port is open or being filtered. The UDP, IP protocol, FIN, NULL, and Xmas scans classify ports this way.

           This state is used when Nmap is unable to determine whether a port is closed or filtered. It is only used
           for the IP ID idle scan.

       As a novice performing automotive repair, I can struggle for hours trying to fit my rudimentary tools (hammer,
       duct tape, wrench, etc.) to the task at hand. When I fail miserably and tow my jalopy to a real mechanic, he
       invariably fishes around in a huge tool chest until pulling out the perfect gizmo which makes the job seem
       effortless. The art of port scanning is similar. Experts understand the dozens of scan techniques and choose
       the appropriate one (or combination) for a given task. Inexperienced users and script kiddies,.  on the other
       hand, try to solve every problem with the default SYN scan. Since Nmap is free, the only barrier to port
       scanning mastery is knowledge. That certainly beats the automotive world, where it may take great skill to
       determine that you need a strut spring compressor, then you still have to pay thousands of dollars for it.

       Most of the scan types are only available to privileged users..  This is because they send and receive raw
       packets,.  which requires root access on Unix systems. Using an administrator account on Windows is
       recommended, though Nmap sometimes works for unprivileged users on that platform when WinPcap has already been
       loaded into the OS. Requiring root privileges was a serious limitation when Nmap was released in 1997, as many
       users only had access to shared shell accounts. Now, the world is different. Computers are cheaper, far more
       people have always-on direct Internet access, and desktop Unix systems (including Linux and Mac OS X) are
       prevalent. A Windows version of Nmap is now available, allowing it to run on even more desktops. For all these
       reasons, users have less need to run Nmap from limited shared shell accounts. This is fortunate, as the
       privileged options make Nmap far more powerful and flexible.

       While Nmap attempts to produce accurate results, keep in mind that all of its insights are based on packets
       returned by the target machines (or firewalls in front of them). Such hosts may be untrustworthy and send
       responses intended to confuse or mislead Nmap. Much more common are non-RFC-compliant hosts that do not respond
       as they should to Nmap probes. FIN, NULL, and Xmas scans are particularly susceptible to this problem. Such
       issues are specific to certain scan types and so are discussed in the individual scan type entries.

       This section documents the dozen or so port scan techniques supported by Nmap. Only one method may be used at a
       time, except that UDP scan (-sU) and any one of the SCTP scan types (-sY, -sZ) may be combined with any one of
       the TCP scan types. As a memory aid, port scan type options are of the form -sC, where C is a prominent
       character in the scan name, usually the first. The one exception to this is the deprecated FTP bounce scan
       (-b). By default, Nmap performs a SYN Scan, though it substitutes a connect scan if the user does not have
       proper privileges to send raw packets (requires root access on Unix) or if IPv6 targets were specified. Of the
       scans listed in this section, unprivileged users can only execute connect and FTP bounce scans.

       -sS (TCP SYN scan) .
           SYN scan is the default and most popular scan option for good reasons. It can be performed quickly,
           scanning thousands of ports per second on a fast network not hampered by restrictive firewalls. It is also
           relatively unobtrusive and stealthy since it never completes TCP connections. SYN scan works against any
           compliant TCP stack rather than depending on idiosyncrasies of specific platforms as Nmap's FIN/NULL/Xmas,
           Maimon and idle scans do. It also allows clear, reliable differentiation between the open, closed, and
           filtered states.

           This technique is often referred to as half-open scanning, because you don't open a full TCP connection.
           You send a SYN packet, as if you are going to open a real connection and then wait for a response. A
           SYN/ACK indicates the port is listening (open), while a RST (reset) is indicative of a non-listener. If no
           response is received after several retransmissions, the port is marked as filtered. The port is also marked
           filtered if an ICMP unreachable error (type 3, code 1, 2, 3, 9, 10, or 13) is received. The port is also
           considered open if a SYN packet (without the ACK flag) is received in response. This can be due to an
           extremely rare TCP feature known as a simultaneous open or split handshake connection (see

       -sT (TCP connect scan) .
           TCP connect scan is the default TCP scan type when SYN scan is not an option. This is the case when a user
           does not have raw packet privileges or is scanning IPv6 networks. Instead of writing raw packets as most
           other scan types do, Nmap asks the underlying operating system to establish a connection with the target
           machine and port by issuing the connect system call. This is the same high-level system call that web
           browsers, P2P clients, and most other network-enabled applications use to establish a connection. It is
           part of a programming interface known as the Berkeley Sockets API. Rather than read raw packet responses
           off the wire, Nmap uses this API to obtain status information on each connection attempt.

           When SYN scan is available, it is usually a better choice. Nmap has less control over the high level
           connect call than with raw packets, making it less efficient. The system call completes connections to open
           target ports rather than performing the half-open reset that SYN scan does. Not only does this take longer
           and require more packets to obtain the same information, but target machines are more likely to log the
           connection. A decent IDS will catch either, but most machines have no such alarm system. Many services on
           your average Unix system will add a note to syslog, and sometimes a cryptic error message, when Nmap
           connects and then closes the connection without sending data. Truly pathetic services crash when this
           happens, though that is uncommon. An administrator who sees a bunch of connection attempts in her logs from
           a single system should know that she has been connect scanned.

       -sU (UDP scans) .
           While most popular services on the Internet run over the TCP protocol, UDP[6] services are widely deployed.
           DNS, SNMP, and DHCP (registered ports 53, 161/162, and 67/68) are three of the most common. Because UDP
           scanning is generally slower and more difficult than TCP, some security auditors ignore these ports. This
           is a mistake, as exploitable UDP services are quite common and attackers certainly don't ignore the whole
           protocol. Fortunately, Nmap can help inventory UDP ports.

           UDP scan is activated with the -sU option. It can be combined with a TCP scan type such as SYN scan (-sS)
           to check both protocols during the same run.

           UDP scan works by sending a UDP packet to every targeted port. For some common ports such as 53 and 161, a
           protocol-specific payload is sent, but for most ports the packet is empty..  The --data-length option can
           be used to send a fixed-length random payload to every port. If an ICMP port unreachable error (type 3,
           code 3) is returned, the port is closed. Other ICMP unreachable errors (type 3, codes 1, 2, 9, 10, or 13)
           mark the port as filtered. Occasionally, a service will respond with a UDP packet, proving that it is open.
           If no response is received after retransmissions, the port is classified as open|filtered. This means that
           the port could be open, or perhaps packet filters are blocking the communication. Version detection (-sV)
           can be used to help differentiate the truly open ports from the filtered ones.

           A big challenge with UDP scanning is doing it quickly. Open and filtered ports rarely send any response,
           leaving Nmap to time out and then conduct retransmissions just in case the probe or response were lost.
           Closed ports are often an even bigger problem. They usually send back an ICMP port unreachable error. But
           unlike the RST packets sent by closed TCP ports in response to a SYN or connect scan, many hosts rate
           limit.  ICMP port unreachable messages by default. Linux and Solaris are particularly strict about this.
           For example, the Linux 2.4.20 kernel limits destination unreachable messages to one per second (in

           Nmap detects rate limiting and slows down accordingly to avoid flooding the network with useless packets
           that the target machine will drop. Unfortunately, a Linux-style limit of one packet per second makes a
           65,536-port scan take more than 18 hours. Ideas for speeding your UDP scans up include scanning more hosts
           in parallel, doing a quick scan of just the popular ports first, scanning from behind the firewall, and
           using --host-timeout to skip slow hosts.

       -sY (SCTP INIT scan) .

           SCTP[7] is a relatively new alternative to the TCP and UDP protocols, combining most characteristics of TCP
           and UDP, and also adding new features like multi-homing and multi-streaming. It is mostly being used for
           SS7/SIGTRAN related services but has the potential to be used for other applications as well. SCTP INIT
           scan is the SCTP equivalent of a TCP SYN scan. It can be performed quickly, scanning thousands of ports per
           second on a fast network not hampered by restrictive firewalls. Like SYN scan, INIT scan is relatively
           unobtrusive and stealthy, since it never completes SCTP associations. It also allows clear, reliable
           differentiation between the open, closed, and filtered states.

           This technique is often referred to as half-open scanning, because you don't open a full SCTP association.
           You send an INIT chunk, as if you are going to open a real association and then wait for a response. An
           INIT-ACK chunk indicates the port is listening (open), while an ABORT chunk is indicative of a
           non-listener. If no response is received after several retransmissions, the port is marked as filtered. The
           port is also marked filtered if an ICMP unreachable error (type 3, code 1, 2, 3, 9, 10, or 13) is received.

       -sN; -sF; -sX (TCP NULL, FIN, and Xmas scans) .
           These three scan types (even more are possible with the --scanflags option described in the next section)
           exploit a subtle loophole in the TCP RFC[8] to differentiate between open and closed ports. Page 65 of RFC
           793 says that "if the [destination] port state is CLOSED .... an incoming segment not containing a RST
           causes a RST to be sent in response."  Then the next page discusses packets sent to open ports without the
           SYN, RST, or ACK bits set, stating that: "you are unlikely to get here, but if you do, drop the segment,
           and return."

           When scanning systems compliant with this RFC text, any packet not containing SYN, RST, or ACK bits will
           result in a returned RST if the port is closed and no response at all if the port is open. As long as none
           of those three bits are included, any combination of the other three (FIN, PSH, and URG) are OK. Nmap
           exploits this with three scan types:

           Null scan (-sN)
               Does not set any bits (TCP flag header is 0)

           FIN scan (-sF)
               Sets just the TCP FIN bit.

           Xmas scan (-sX)
               Sets the FIN, PSH, and URG flags, lighting the packet up like a Christmas tree.

           These three scan types are exactly the same in behavior except for the TCP flags set in probe packets. If a
           RST packet is received, the port is considered closed, while no response means it is open|filtered. The
           port is marked filtered if an ICMP unreachable error (type 3, code 1, 2, 3, 9, 10, or 13) is received.

           The key advantage to these scan types is that they can sneak through certain non-stateful firewalls and
           packet filtering routers. Another advantage is that these scan types are a little more stealthy than even a
           SYN scan. Don't count on this though--most modern IDS products can be configured to detect them. The big
           downside is that not all systems follow RFC 793 to the letter. A number of systems send RST responses to
           the probes regardless of whether the port is open or not. This causes all of the ports to be labeled
           closed. Major operating systems that do this are Microsoft Windows, many Cisco devices, BSDI, and IBM
           OS/400. This scan does work against most Unix-based systems though. Another downside of these scans is that
           they can't distinguish open ports from certain filtered ones, leaving you with the response open|filtered.

       -sA (TCP ACK scan) .
           This scan is different than the others discussed so far in that it never determines open (or even
           open|filtered) ports. It is used to map out firewall rulesets, determining whether they are stateful or not
           and which ports are filtered.

           The ACK scan probe packet has only the ACK flag set (unless you use --scanflags). When scanning unfiltered
           systems, open and closed ports will both return a RST packet. Nmap then labels them as unfiltered, meaning
           that they are reachable by the ACK packet, but whether they are open or closed is undetermined. Ports that
           don't respond, or send certain ICMP error messages back (type 3, code 1, 2, 3, 9, 10, or 13), are labeled

       -sW (TCP Window scan) .
           Window scan is exactly the same as ACK scan except that it exploits an implementation detail of certain
           systems to differentiate open ports from closed ones, rather than always printing unfiltered when a RST is
           returned. It does this by examining the TCP Window field of the RST packets returned. On some systems, open
           ports use a positive window size (even for RST packets) while closed ones have a zero window. So instead of
           always listing a port as unfiltered when it receives a RST back, Window scan lists the port as open or
           closed if the TCP Window value in that reset is positive or zero, respectively.

           This scan relies on an implementation detail of a minority of systems out on the Internet, so you can't
           always trust it. Systems that don't support it will usually return all ports closed. Of course, it is
           possible that the machine really has no open ports. If most scanned ports are closed but a few common port
           numbers (such as 22, 25, 53) are filtered, the system is most likely susceptible. Occasionally, systems
           will even show the exact opposite behavior. If your scan shows 1,000 open ports and three closed or
           filtered ports, then those three may very well be the truly open ones.

       -sM (TCP Maimon scan) .
           The Maimon scan is named after its discoverer, Uriel Maimon..  He described the technique in Phrack
           Magazine issue #49 (November 1996)..  Nmap, which included this technique, was released two issues later.
           This technique is exactly the same as NULL, FIN, and Xmas scans, except that the probe is FIN/ACK.
           According to RFC 793[8] (TCP), a RST packet should be generated in response to such a probe whether the
           port is open or closed. However, Uriel noticed that many BSD-derived systems simply drop the packet if the
           port is open.

       --scanflags (Custom TCP scan) .
           Truly advanced Nmap users need not limit themselves to the canned scan types offered. The --scanflags
           option allows you to design your own scan by specifying arbitrary TCP flags..  Let your creative juices
           flow, while evading intrusion detection systems.  whose vendors simply paged through the Nmap man page
           adding specific rules!

           The --scanflags argument can be a numerical flag value such as 9 (PSH and FIN), but using symbolic names is
           easier. Just mash together any combination of URG, ACK, PSH, RST, SYN, and FIN. For example, --scanflags
           URGACKPSHRSTSYNFIN sets everything, though it's not very useful for scanning. The order these are specified
           in is irrelevant.

           In addition to specifying the desired flags, you can specify a TCP scan type (such as -sA or -sF). That
           base type tells Nmap how to interpret responses. For example, a SYN scan considers no-response to indicate
           a filtered port, while a FIN scan treats the same as open|filtered. Nmap will behave the same way it does
           for the base scan type, except that it will use the TCP flags you specify instead. If you don't specify a
           base type, SYN scan is used.

       -sZ (SCTP COOKIE ECHO scan) .
           SCTP COOKIE ECHO scan is a more advanced SCTP scan. It takes advantage of the fact that SCTP
           implementations should silently drop packets containing COOKIE ECHO chunks on open ports, but send an ABORT
           if the port is closed. The advantage of this scan type is that it is not as obvious a port scan than an
           INIT scan. Also, there may be non-stateful firewall rulesets blocking INIT chunks, but not COOKIE ECHO
           chunks. Don't be fooled into thinking that this will make a port scan invisible; a good IDS will be able to
           detect SCTP COOKIE ECHO scans too. The downside is that SCTP COOKIE ECHO scans cannot differentiate between
           open and filtered ports, leaving you with the state open|filtered in both cases.

       -sI zombie host[:probeport] (idle scan) .
           This advanced scan method allows for a truly blind TCP port scan of the target (meaning no packets are sent
           to the target from your real IP address). Instead, a unique side-channel attack exploits predictable IP
           fragmentation ID sequence generation on the zombie host to glean information about the open ports on the
           target. IDS systems will display the scan as coming from the zombie machine you specify (which must be up
           and meet certain criteria).  This fascinating scan type is too complex to fully describe in this reference
           guide, so I wrote and posted an informal paper with full details at

           Besides being extraordinarily stealthy (due to its blind nature), this scan type permits mapping out
           IP-based trust relationships between machines. The port listing shows open ports from the perspective of
           the zombie host.  So you can try scanning a target using various zombies that you think might be trusted.
           (via router/packet filter rules).

           You can add a colon followed by a port number to the zombie host if you wish to probe a particular port on
           the zombie for IP ID changes. Otherwise Nmap will use the port it uses by default for TCP pings (80).

       -sO (IP protocol scan) .
           IP protocol scan allows you to determine which IP protocols (TCP, ICMP, IGMP, etc.) are supported by target
           machines. This isn't technically a port scan, since it cycles through IP protocol numbers rather than TCP
           or UDP port numbers. Yet it still uses the -p option to select scanned protocol numbers, reports its
           results within the normal port table format, and even uses the same underlying scan engine as the true port
           scanning methods. So it is close enough to a port scan that it belongs here.

           Besides being useful in its own right, protocol scan demonstrates the power of open-source software. While
           the fundamental idea is pretty simple, I had not thought to add it nor received any requests for such
           functionality. Then in the summer of 2000, Gerhard Rieger.  conceived the idea, wrote an excellent patch
           implementing it, and sent it to the nmap-hackers mailing list..  I incorporated that patch into the Nmap
           tree and released a new version the next day. Few pieces of commercial software have users enthusiastic
           enough to design and contribute their own improvements!

           Protocol scan works in a similar fashion to UDP scan. Instead of iterating through the port number field of
           a UDP packet, it sends IP packet headers and iterates through the eight-bit IP protocol field. The headers
           are usually empty, containing no data and not even the proper header for the claimed protocol. The
           exceptions are TCP, UDP, ICMP, SCTP, and IGMP. A proper protocol header for those is included since some
           systems won't send them otherwise and because Nmap already has functions to create them. Instead of
           watching for ICMP port unreachable messages, protocol scan is on the lookout for ICMP protocol unreachable
           messages. If Nmap receives any response in any protocol from the target host, Nmap marks that protocol as
           open. An ICMP protocol unreachable error (type 3, code 2) causes the protocol to be marked as closed Other
           ICMP unreachable errors (type 3, code 1, 3, 9, 10, or 13) cause the protocol to be marked filtered (though
           they prove that ICMP is open at the same time). If no response is received after retransmissions, the
           protocol is marked open|filtered

       -b FTP relay host (FTP bounce scan) .
           An interesting feature of the FTP protocol (RFC 959[9]) is support for so-called proxy FTP connections.
           This allows a user to connect to one FTP server, then ask that files be sent to a third-party server. Such
           a feature is ripe for abuse on many levels, so most servers have ceased supporting it. One of the abuses
           this feature allows is causing the FTP server to port scan other hosts. Simply ask the FTP server to send a
           file to each interesting port of a target host in turn. The error message will describe whether the port is
           open or not. This is a good way to bypass firewalls because organizational FTP servers are often placed
           where they have more access to other internal hosts than any old Internet host would. Nmap supports FTP
           bounce scan with the -b option. It takes an argument of the form username:password@server:port.  Server is
           the name or IP address of a vulnerable FTP server. As with a normal URL, you may omit username:password, in
           which case anonymous login credentials (user: anonymous password:-wwwuser@) are used. The port number (and
           preceding colon) may be omitted as well, in which case the default FTP port (21) on server is used.

           This vulnerability was widespread in 1997 when Nmap was released, but has largely been fixed. Vulnerable
           servers are still around, so it is worth trying when all else fails. If bypassing a firewall is your goal,
           scan the target network for port 21 (or even for any FTP services if you scan all ports with version
           detection) and use the ftp-bounce.  NSE script. Nmap will tell you whether the host is vulnerable or not.
           If you are just trying to cover your tracks, you don't need to (and, in fact, shouldn't) limit yourself to
           hosts on the target network. Before you go scanning random Internet addresses for vulnerable FTP servers,
           consider that sysadmins may not appreciate you abusing their servers in this way.

       In addition to all of the scan methods discussed previously, Nmap offers options for specifying which ports are
       scanned and whether the scan order is randomized or sequential. By default, Nmap scans the most common 1,000
       ports for each protocol.

       -p port ranges (Only scan specified ports) .
           This option specifies which ports you want to scan and overrides the default. Individual port numbers are
           OK, as are ranges separated by a hyphen (e.g.  1-1023). The beginning and/or end values of a range may be
           omitted, causing Nmap to use 1 and 65535, respectively. So you can specify -p- to scan ports from 1 through
           65535. Scanning port zero.  is allowed if you specify it explicitly. For IP protocol scanning (-sO), this
           option specifies the protocol numbers you wish to scan for (0-255).

           When scanning both TCP and UDP ports, you can specify a particular protocol by preceding the port numbers
           by T: or U:. The qualifier lasts until you specify another qualifier. For example, the argument -p
           U:53,111,137,T:21-25,80,139,8080 would scan UDP ports 53, 111,and 137, as well as the listed TCP ports.
           Note that to scan both UDP and TCP, you have to specify -sU and at least one TCP scan type (such as -sS,
           -sF, or -sT). If no protocol qualifier is given, the port numbers are added to all protocol lists.  Ports
           can also be specified by name according to what the port is referred to in the nmap-services. You can even
           use the wildcards * and ?  with the names. For example, to scan FTP and all ports whose names begin with
           "http", use -p ftp,http*. Be careful about shell expansions and quote the argument to -p if unsure.

           Ranges of ports can be surrounded by square brackets to indicate ports inside that range that appear in
           nmap-services. For example, the following will scan all ports in nmap-services equal to or below 1024: -p
           [-1024]. Be careful with shell expansions and quote the argument to -p if unsure.

       -F (Fast (limited port) scan) .
           Specifies that you wish to scan fewer ports than the default. Normally Nmap scans the most common 1,000
           ports for each scanned protocol. With -F, this is reduced to 100.

           Nmap needs an nmap-services file with frequency information in order to know which ports are the most
           common. If port frequency information isn't available, perhaps because of the use of a custom nmap-services
           file, -F means to scan only ports that are named in the services file (normally Nmap scans all named ports
           plus ports 1-1024).

       -r (Don't randomize ports) .
           By default, Nmap randomizes the scanned port order (except that certain commonly accessible ports are moved
           near the beginning for efficiency reasons). This randomization is normally desirable, but you can specify
           -r for sequential (sorted from lowest to highest) port scanning instead.

       --port-ratio ratio<decimal number between 0 and 1>
           Scans all ports in nmap-services file with a ratio greater than the one given.  ratio must be between 0.0
           and 1.1.

       --top-ports n
           Scans the n highest-ratio ports found in nmap-services file.  n must be 1 or greater.

       Point Nmap at a remote machine and it might tell you that ports 25/tcp, 80/tcp, and 53/udp are open. Using its
       nmap-services.  database of about 2,200 well-known services,.  Nmap would report that those ports probably
       correspond to a mail server (SMTP), web server (HTTP), and name server (DNS) respectively. This lookup is
       usually accurate--the vast majority of daemons listening on TCP port 25 are, in fact, mail servers. However, you
       should not bet your security on this! People can and do run services on strange ports..

       Even if Nmap is right, and the hypothetical server above is running SMTP, HTTP, and DNS servers, that is not a
       lot of information. When doing vulnerability assessments (or even simple network inventories) of your companies
       or clients, you really want to know which mail and DNS servers and versions are running. Having an accurate
       version number helps dramatically in determining which exploits a server is vulnerable to. Version detection
       helps you obtain this information.

       After TCP and/or UDP ports are discovered using one of the other scan methods, version detection interrogates
       those ports to determine more about what is actually running. The nmap-service-probes.  database contains
       probes for querying various services and match expressions to recognize and parse responses. Nmap tries to
       determine the service protocol (e.g. FTP, SSH, Telnet, HTTP), the application name (e.g. ISC BIND, Apache
       httpd, Solaris telnetd), the version number, hostname, device type (e.g. printer, router), the OS family (e.g.
       Windows, Linux) and sometimes miscellaneous details like whether an X server is open to connections, the SSH
       protocol version, or the KaZaA user name). Of course, most services don't provide all of this information. If
       Nmap was compiled with OpenSSL support, it will connect to SSL servers to deduce the service listening behind
       that encryption layer..  When RPC services are discovered, the Nmap RPC grinder.  (-sR).  is automatically used
       to determine the RPC program and version numbers. Some UDP ports are left in the open|filtered state after a
       UDP port scan is unable to determine whether the port is open or filtered. Version detection will try to elicit
       a response from these ports (just as it does with open ports), and change the state to open if it succeeds.
       open|filtered TCP ports are treated the same way. Note that the Nmap -A option enables version detection among
       other things.  A paper documenting the workings, usage, and customization of version detection is available at

       When Nmap receives responses from a service but cannot match them to its database, it prints out a special
       fingerprint and a URL for you to submit if to if you know for sure what is running on the port. Please take a
       couple minutes to make the submission so that your find can benefit everyone. Thanks to these submissions, Nmap
       has about 6,500 pattern matches for more than 650 protocols such as SMTP, FTP, HTTP, etc..

       Version detection is enabled and controlled with the following options:

       -sV (Version detection) .
           Enables version detection, as discussed above. Alternatively, you can use -A, which enables version
           detection among other things.

       --allports (Don't exclude any ports from version detection) .
           By default, Nmap version detection skips TCP port 9100 because some printers simply print anything sent to
           that port, leading to dozens of pages of HTTP GET requests, binary SSL session requests, etc. This behavior
           can be changed by modifying or removing the Exclude directive in nmap-service-probes, or you can specify
           --allports to scan all ports regardless of any Exclude directive.

       --version-intensity intensity (Set version scan intensity) .
           When performing a version scan (-sV), Nmap sends a series of probes, each of which is assigned a rarity
           value between one and nine. The lower-numbered probes are effective against a wide variety of common
           services, while the higher-numbered ones are rarely useful. The intensity level specifies which probes
           should be applied. The higher the number, the more likely it is the service will be correctly identified.
           However, high intensity scans take longer. The intensity must be between 0 and 9..  The default is 7..
           When a probe is registered to the target port via the nmap-service-probes ports directive, that probe is
           tried regardless of intensity level. This ensures that the DNS probes will always be attempted against any
           open port 53, the SSL probe will be done against 443, etc.

       --version-light (Enable light mode) .
           This is a convenience alias for --version-intensity 2. This light mode makes version scanning much faster,
           but it is slightly less likely to identify services.

       --version-all (Try every single probe) .
           An alias for --version-intensity 9, ensuring that every single probe is attempted against each port.

       --version-trace (Trace version scan activity) .
           This causes Nmap to print out extensive debugging info about what version scanning is doing. It is a subset
           of what you get with --packet-trace.

       -sR (RPC scan) .
           This method works in conjunction with the various port scan methods of Nmap. It takes all the TCP/UDP ports
           found open and floods them with SunRPC program NULL commands in an attempt to determine whether they are
           RPC ports, and if so, what program and version number they serve up. Thus you can effectively obtain the
           same info as rpcinfo -p even if the target's portmapper is behind a firewall (or protected by TCP
           wrappers). Decoys do not currently work with RPC scan..  This is automatically enabled as part of version
           scan (-sV) if you request that. As version detection includes this and is much more comprehensive, -sR is
           rarely needed.

       One of Nmap's best-known features is remote OS detection using TCP/IP stack fingerprinting. Nmap sends a series
       of TCP and UDP packets to the remote host and examines practically every bit in the responses. After performing
       dozens of tests such as TCP ISN sampling, TCP options support and ordering, IP ID sampling, and the initial
       window size check, Nmap compares the results to its nmap-os-db.  database of more than 2,600 known OS
       fingerprints and prints out the OS details if there is a match. Each fingerprint includes a freeform textual
       description of the OS, and a classification which provides the vendor name (e.g. Sun), underlying OS (e.g.
       Solaris), OS generation (e.g. 10), and device type (general purpose, router, switch, game console, etc).

       If Nmap is unable to guess the OS of a machine, and conditions are good (e.g. at least one open port and one
       closed port were found), Nmap will provide a URL you can use to submit the fingerprint if you know (for sure)
       the OS running on the machine. By doing this you contribute to the pool of operating systems known to Nmap and
       thus it will be more accurate for everyone.

       OS detection enables some other tests which make use of information that is gathered during the process anyway.
       One of these is TCP Sequence Predictability Classification. This measures approximately how hard it is to
       establish a forged TCP connection against the remote host. It is useful for exploiting source-IP based trust
       relationships (rlogin, firewall filters, etc) or for hiding the source of an attack. This sort of spoofing is
       rarely performed any more, but many machines are still vulnerable to it. The actual difficulty number is based
       on statistical sampling and may fluctuate. It is generally better to use the English classification such as
       "worthy challenge" or "trivial joke". This is only reported in normal output in verbose (-v) mode. When verbose
       mode is enabled along with -O, IP ID sequence generation is also reported. Most machines are in the
       "incremental" class, which means that they increment the ID field in the IP header for each packet they send.
       This makes them vulnerable to several advanced information gathering and spoofing attacks.

       Another bit of extra information enabled by OS detection is a guess at a target's uptime. This uses the TCP
       timestamp option (RFC 1323[10]) to guess when a machine was last rebooted. The guess can be inaccurate due to
       the timestamp counter not being initialized to zero or the counter overflowing and wrapping around, so it is
       printed only in verbose mode.

       A paper documenting the workings, usage, and customization of OS detection is available at

       OS detection is enabled and controlled with the following options:

       -O (Enable OS detection) .
           Enables OS detection, as discussed above. Alternatively, you can use -A to enable OS detection along with
           other things.

       --osscan-limit (Limit OS detection to promising targets) .
           OS detection is far more effective if at least one open and one closed TCP port are found. Set this option
           and Nmap will not even try OS detection against hosts that do not meet this criteria. This can save
           substantial time, particularly on -Pn scans against many hosts. It only matters when OS detection is
           requested with -O or -A.

       --osscan-guess; --fuzzy (Guess OS detection results) .
           When Nmap is unable to detect a perfect OS match, it sometimes offers up near-matches as possibilities. The
           match has to be very close for Nmap to do this by default. Either of these (equivalent) options make Nmap
           guess more aggressively. Nmap will still tell you when an imperfect match is printed and display its
           confidence level (percentage) for each guess.

       --max-os-tries (Set the maximum number of OS detection tries against a target) .
           When Nmap performs OS detection against a target and fails to find a perfect match, it usually repeats the
           attempt. By default, Nmap tries five times if conditions are favorable for OS fingerprint submission, and
           twice when conditions aren't so good. Specifying a lower --max-os-tries value (such as 1) speeds Nmap up,
           though you miss out on retries which could potentially identify the OS. Alternatively, a high value may be
           set to allow even more retries when conditions are favorable. This is rarely done, except to generate
           better fingerprints for submission and integration into the Nmap OS database.

       The Nmap Scripting Engine (NSE) is one of Nmap's most powerful and flexible features. It allows users to write
       (and share) simple scripts (using the Lua programming language[11],

       Tasks we had in mind when creating the system include network discovery, more sophisticated version detection,
       vulnerability detection. NSE can even be used for vulnerability exploitation.

       To reflect those different uses and to simplify the choice of which scripts to run, each script contains a
       field associating it with one or more categories. Currently defined categories are auth, default.  discovery,
       dos, exploit, external, fuzzer, intrusive, malware, safe, version, and vuln. These are all described at

       Scripts are not run in a sandbox and thus could accidentally or maliciously damage your system or invade your
       privacy. Never run scripts from third parties unless you trust the authors or have carefully audited the
       scripts yourself.

       The Nmap Scripting Engine is described in detail at

       and is controlled by the following options:

       -sC .
           Performs a script scan using the default set of scripts. It is equivalent to --script=default. Some of the
           scripts in this category are considered intrusive and should not be run against a target network without

       --script filename|category|directory|expression|all[,...] .
           Runs a script scan using the comma-separated list of filenames, script categories, and directories. Each
           element in the list may also be a Boolean expression describing a more complex set of scripts. Each element
           is interpreted first as an expression, then as a category, and finally as a file or directory name. The
           special argument all makes every script in Nmap's script database eligible to run. The all argument should
           be used with caution as NSE may contain dangerous scripts including exploits, brute force authentication
           crackers, and denial of service attacks.

           File and directory names may be relative or absolute. Absolute names are used directly. Relative paths are
           looked for in the following places until found:
               ~/.nmap (not searched on Windows).
               the current directory
           A scripts subdirectory is also tried in each of these.

           When a directory name is given, Nmap loads every file in the directory whose name ends with .nse. All other
           files are ignored and directories are not searched recursively. When a filename is given, it does not have
           to have the .nse extension; it will be added automatically if necessary.  Nmap scripts are stored in a
           scripts subdirectory of the Nmap data directory by default (see

           For efficiency, scripts are indexed in a database stored in scripts/script.db,.  which lists the category
           or categories in which each script belongs.  When referring to scripts from script.db by name, you can use
           a shell-style '*' wildcard.

           nmap --script "http-*"
               Loads all scripts whose name starts with http-, such as http-auth.nse and http-open-proxy.nse. The
               argument to --script had to be in quotes to protect the wildcard from the shell.

           More complicated script selection can be done using the and, or, and not operators to build Boolean
           expressions. The operators have the same precedence[12] as in Lua: not is the highest, followed by and and
           then or. You can alter precedence by using parentheses. Because expressions contain space characters it is
           necessary to quote them.

           nmap --script "not intrusive"
               Loads every script except for those in the intrusive category.

           nmap --script "default or safe"
               This is functionally equivalent to nmap --script "default,safe". It loads all scripts that are in the
               default category or the safe category or both.

           nmap --script "default and safe"
               Loads those scripts that are in both the default and safe categories.

           nmap --script "(default or safe or intrusive) and not http-*"
               Loads scripts in the default, safe, or intrusive categories, except for those whose names start with

       --script-args n1=v1,n2={n3=v3},n4={v4,v5} .
           Lets you provide arguments to NSE scripts. Arguments are a comma-separated list of name=value pairs. Names
           and values may be strings not containing whitespace or the characters '{', '}', '=', or ','. To include one
           of these characters in a string, enclose the string in single or double quotes. Within a quoted string, '\'
           escapes a quote. A backslash is only used to escape quotation marks in this special case; in all other
           cases a backslash is interpreted literally. Values may also be tables enclosed in {}, just as in Lua. A
           table may contain simple string values or more name-value pairs, including nested tables. A complex example
           of script arguments is The online NSE Documentation Portal at lists the arguments
           that each script accepts.

       --script-trace .
           This option does what --packet-trace does, just one ISO layer higher. If this option is specified all
           incoming and outgoing communication performed by a script is printed. The displayed information includes
           the communication protocol, the source, the target and the transmitted data. If more than 5% of all
           transmitted data is not printable, then the trace output is in a hex dump format. Specifying --packet-trace
           enables script tracing too.

       --script-updatedb .
           This option updates the script database found in scripts/script.db which is used by Nmap to determine the
           available default scripts and categories. It is only necessary to update the database if you have added or
           removed NSE scripts from the default scripts directory or if you have changed the categories of any script.
           This option is generally used by itself: nmap --script-updatedb.

       One of my highest Nmap development priorities has always been performance. A default scan (nmap hostname) of a
       host on my local network takes a fifth of a second. That is barely enough time to blink, but adds up when you
       are scanning hundreds or thousands of hosts. Moreover, certain scan options such as UDP scanning and version
       detection can increase scan times substantially. So can certain firewall configurations, particularly response
       rate limiting. While Nmap utilizes parallelism and many advanced algorithms to accelerate these scans, the user
       has ultimate control over how Nmap runs. Expert users carefully craft Nmap commands to obtain only the
       information they care about while meeting their time constraints.

       Techniques for improving scan times include omitting non-critical tests, and upgrading to the latest version of
       Nmap (performance enhancements are made frequently). Optimizing timing parameters can also make a substantial
       difference. Those options are listed below.

       Some options accept a time parameter. This is specified in seconds by default, though you can append 'ms', 's',
       'm', or 'h' to the value to specify milliseconds, seconds, minutes, or hours. So the --host-timeout arguments
       900000ms, 900, 900s, and 15m all do the same thing.

       --min-hostgroup numhosts; --max-hostgroup numhosts (Adjust parallel scan group sizes) .
           Nmap has the ability to port scan or version scan multiple hosts in parallel. Nmap does this by dividing
           the target IP space into groups and then scanning one group at a time. In general, larger groups are more
           efficient. The downside is that host results can't be provided until the whole group is finished. So if
           Nmap started out with a group size of 50, the user would not receive any reports (except for the updates
           offered in verbose mode) until the first 50 hosts are completed.

           By default, Nmap takes a compromise approach to this conflict. It starts out with a group size as low as
           five so the first results come quickly and then increases the groupsize to as high as 1024. The exact
           default numbers depend on the options given. For efficiency reasons, Nmap uses larger group sizes for UDP
           or few-port TCP scans.

           When a maximum group size is specified with --max-hostgroup, Nmap will never exceed that size. Specify a
           minimum size with --min-hostgroup and Nmap will try to keep group sizes above that level. Nmap may have to
           use smaller groups than you specify if there are not enough target hosts left on a given interface to
           fulfill the specified minimum. Both may be set to keep the group size within a specific range, though this
           is rarely desired.

           These options do not have an effect during the host discovery phase of a scan. This includes plain ping
           scans (-sn). Host discovery always works in large groups of hosts to improve speed and accuracy.

           The primary use of these options is to specify a large minimum group size so that the full scan runs more
           quickly. A common choice is 256 to scan a network in Class C sized chunks. For a scan with many ports,
           exceeding that number is unlikely to help much. For scans of just a few port numbers, host group sizes of
           2048 or more may be helpful.

       --min-parallelism numprobes; --max-parallelism numprobes (Adjust probe parallelization) .
           These options control the total number of probes that may be outstanding for a host group. They are used
           for port scanning and host discovery. By default, Nmap calculates an ever-changing ideal parallelism based
           on network performance. If packets are being dropped, Nmap slows down and allows fewer outstanding probes.
           The ideal probe number slowly rises as the network proves itself worthy. These options place minimum or
           maximum bounds on that variable. By default, the ideal parallelism can drop to one if the network proves
           unreliable and rise to several hundred in perfect conditions.

           The most common usage is to set --min-parallelism to a number higher than one to speed up scans of poorly
           performing hosts or networks. This is a risky option to play with, as setting it too high may affect
           accuracy. Setting this also reduces Nmap's ability to control parallelism dynamically based on network
           conditions. A value of 10 might be reasonable, though I only adjust this value as a last resort.

           The --max-parallelism option is sometimes set to one to prevent Nmap from sending more than one probe at a
           time to hosts. The --scan-delay option, discussed later, is another way to do this.

       --min-rtt-timeout time, --max-rtt-timeout time, --initial-rtt-timeout time (Adjust probe timeouts) .
           Nmap maintains a running timeout value for determining how long it will wait for a probe response before
           giving up or retransmitting the probe. This is calculated based on the response times of previous probes.

           If the network latency shows itself to be significant and variable, this timeout can grow to several
           seconds. It also starts at a conservative (high) level and may stay that way for a while when Nmap scans
           unresponsive hosts.

           Specifying a lower --max-rtt-timeout and --initial-rtt-timeout than the defaults can cut scan times
           significantly. This is particularly true for pingless (-Pn) scans, and those against heavily filtered
           networks. Don't get too aggressive though. The scan can end up taking longer if you specify such a low
           value that many probes are timing out and retransmitting while the response is in transit.

           If all the hosts are on a local network, 100 milliseconds (--max-rtt-timeout 100ms) is a reasonable
           aggressive value. If routing is involved, ping a host on the network first with the ICMP ping utility, or
           with a custom packet crafter such as Nping.  that is more likely to get through a firewall. Look at the
           maximum round trip time out of ten packets or so. You might want to double that for the
           --initial-rtt-timeout and triple or quadruple it for the --max-rtt-timeout. I generally do not set the
           maximum RTT below 100 ms, no matter what the ping times are. Nor do I exceed 1000 ms.

           --min-rtt-timeout is a rarely used option that could be useful when a network is so unreliable that even
           Nmap's default is too aggressive. Since Nmap only reduces the timeout down to the minimum when the network
           seems to be reliable, this need is unusual and should be reported as a bug to the nmap-dev mailing list..

       --max-retries numtries (Specify the maximum number of port scan probe retransmissions) .
           When Nmap receives no response to a port scan probe, it could mean the port is filtered. Or maybe the probe
           or response was simply lost on the network. It is also possible that the target host has rate limiting
           enabled that temporarily blocked the response. So Nmap tries again by retransmitting the initial probe. If
           Nmap detects poor network reliability, it may try many more times before giving up on a port. While this
           benefits accuracy, it also lengthen scan times. When performance is critical, scans may be sped up by
           limiting the number of retransmissions allowed. You can even specify --max-retries 0 to prevent any
           retransmissions, though that is only recommended for situations such as informal surveys where occasional
           missed ports and hosts are acceptable.

           The default (with no -T template) is to allow ten retransmissions. If a network seems reliable and the
           target hosts aren't rate limiting, Nmap usually only does one retransmission. So most target scans aren't
           even affected by dropping --max-retries to a low value such as three. Such values can substantially speed
           scans of slow (rate limited) hosts. You usually lose some information when Nmap gives up on ports early,
           though that may be preferable to letting the --host-timeout expire and losing all information about the

       --host-timeout time (Give up on slow target hosts) .
           Some hosts simply take a long time to scan. This may be due to poorly performing or unreliable networking
           hardware or software, packet rate limiting, or a restrictive firewall. The slowest few percent of the
           scanned hosts can eat up a majority of the scan time. Sometimes it is best to cut your losses and skip
           those hosts initially. Specify --host-timeout with the maximum amount of time you are willing to wait. For
           example, specify 30m to ensure that Nmap doesn't waste more than half an hour on a single host. Note that
           Nmap may be scanning other hosts at the same time during that half an hour, so it isn't a complete loss. A
           host that times out is skipped. No port table, OS detection, or version detection results are printed for
           that host.

       --scan-delay time; --max-scan-delay time (Adjust delay between probes) .
           This option causes Nmap to wait at least the given amount of time between each probe it sends to a given
           host. This is particularly useful in the case of rate limiting..  Solaris machines (among many others) will
           usually respond to UDP scan probe packets with only one ICMP message per second. Any more than that sent by
           Nmap will be wasteful. A --scan-delay of 1s will keep Nmap at that slow rate. Nmap tries to detect rate
           limiting and adjust the scan delay accordingly, but it doesn't hurt to specify it explicitly if you already
           know what rate works best.

           When Nmap adjusts the scan delay upward to cope with rate limiting, the scan slows down dramatically. The
           --max-scan-delay option specifies the largest delay that Nmap will allow. A low --max-scan-delay can speed
           up Nmap, but it is risky. Setting this value too low can lead to wasteful packet retransmissions and
           possible missed ports when the target implements strict rate limiting.

           Another use of --scan-delay is to evade threshold based intrusion detection and prevention systems

       --min-rate number; --max-rate number (Directly control the scanning rate) .
           Nmap's dynamic timing does a good job of finding an appropriate speed at which to scan. Sometimes, however,
           you may happen to know an appropriate scanning rate for a network, or you may have to guarantee that a scan
           will be finished by a certain time. Or perhaps you must keep Nmap from scanning too quickly. The --min-rate
           and --max-rate options are designed for these situations.

           When the --min-rate option is given Nmap will do its best to send packets as fast as or faster than the
           given rate. The argument is a positive real number representing a packet rate in packets per second. For
           example, specifying --min-rate 300 means that Nmap will try to keep the sending rate at or above 300
           packets per second. Specifying a minimum rate does not keep Nmap from going faster if conditions warrant.

           Likewise, --max-rate limits a scan's sending rate to a given maximum. Use --max-rate 100, for example, to
           limit sending to 100 packets per second on a fast network. Use --max-rate 0.1 for a slow scan of one packet
           every ten seconds. Use --min-rate and --max-rate together to keep the rate inside a certain range.

           These two options are global, affecting an entire scan, not individual hosts. They only affect port scans
           and host discovery scans. Other features like OS detection implement their own timing.

           There are two conditions when the actual scanning rate may fall below the requested minimum. The first is
           if the minimum is faster than the fastest rate at which Nmap can send, which is dependent on hardware. In
           this case Nmap will simply send packets as fast as possible, but be aware that such high rates are likely
           to cause a loss of accuracy. The second case is when Nmap has nothing to send, for example at the end of a
           scan when the last probes have been sent and Nmap is waiting for them to time out or be responded to. It's
           normal to see the scanning rate drop at the end of a scan or in between hostgroups. The sending rate may
           temporarily exceed the maximum to make up for unpredictable delays, but on average the rate will stay at or
           below the maximum.

           Specifying a minimum rate should be done with care. Scanning faster than a network can support may lead to
           a loss of accuracy. In some cases, using a faster rate can make a scan take longer than it would with a
           slower rate. This is because Nmap's

           adaptive retransmission algorithms will detect the network congestion caused by an excessive scanning rate
           and increase the number of retransmissions in order to improve accuracy. So even though packets are sent at
           a higher rate, more packets are sent overall. Cap the number of retransmissions with the --max-retries
           option if you need to set an upper limit on total scan time.

       --defeat-rst-ratelimit .
           Many hosts have long used rate limiting.  to reduce the number of ICMP error messages (such as
           port-unreachable errors) they send. Some systems now apply similar rate limits to the RST (reset) packets
           they generate. This can slow Nmap down dramatically as it adjusts its timing to reflect those rate limits.
           You can tell Nmap to ignore those rate limits (for port scans such as SYN scan which don't treat
           non-responsive ports as open) by specifying --defeat-rst-ratelimit.

           Using this option can reduce accuracy, as some ports will appear non-responsive because Nmap didn't wait
           long enough for a rate-limited RST response. With a SYN scan, the non-response results in the port being
           labeled filtered rather than the closed state we see when RST packets are received. This option is useful
           when you only care about open ports, and distinguishing between closed and filtered ports isn't worth the
           extra time.

       -T paranoid|sneaky|polite|normal|aggressive|insane (Set a timing template) .
           While the fine-grained timing controls discussed in the previous section are powerful and effective, some
           people find them confusing. Moreover, choosing the appropriate values can sometimes take more time than the
           scan you are trying to optimize. So Nmap offers a simpler approach, with six timing templates. You can
           specify them with the -T option and their number (0-5) or their name. The template names are paranoid (0),
           sneaky (1), polite (2), normal (3), aggressive (4), and insane (5). The first two are for IDS evasion.
           Polite mode slows down the scan to use less bandwidth and target machine resources. Normal mode is the
           default and so -T3 does nothing. Aggressive mode speeds scans up by making the assumption that you are on a
           reasonably fast and reliable network. Finally insane mode.  assumes that you are on an extraordinarily fast
           network or are willing to sacrifice some accuracy for speed.

           These templates allow the user to specify how aggressive they wish to be, while leaving Nmap to pick the
           exact timing values. The templates also make some minor speed adjustments for which fine-grained control
           options do not currently exist. For example, -T4.  prohibits the dynamic scan delay from exceeding 10 ms
           for TCP ports and -T5 caps that value at 5 ms. Templates can be used in combination with fine-grained
           controls, and the fine-grained controls will you specify will take precedence over the timing template
           default for that parameter. I recommend using -T4 when scanning reasonably modern and reliable networks.
           Keep that option even when you add fine-grained controls so that you benefit from those extra minor
           optimizations that it enables.

           If you are on a decent broadband or ethernet connection, I would recommend always using -T4. Some people
           love -T5 though it is too aggressive for my taste. People sometimes specify -T2 because they think it is
           less likely to crash hosts or because they consider themselves to be polite in general. They often don't
           realize just how slow -T polite.  really is. Their scan may take ten times longer than a default scan.
           Machine crashes and bandwidth problems are rare with the default timing options (-T3) and so I normally
           recommend that for cautious scanners. Omitting version detection is far more effective than playing with
           timing values at reducing these problems.

           While -T0.  and -T1.  may be useful for avoiding IDS alerts, they will take an extraordinarily long time to
           scan thousands of machines or ports. For such a long scan, you may prefer to set the exact timing values
           you need rather than rely on the canned -T0 and -T1 values.

           The main effects of T0 are serializing the scan so only one port is scanned at a time, and waiting five
           minutes between sending each probe.  T1 and T2 are similar but they only wait 15 seconds and 0.4 seconds,
           respectively, between probes.  T3 is Nmap's default behavior, which includes parallelization..  -T4 does
           the equivalent of --max-rtt-timeout 1250ms --initial-rtt-timeout 500ms --max-retries 6 and sets the maximum
           TCP scan delay to 10 milliseconds.  T5 does the equivalent of --max-rtt-timeout 300ms --min-rtt-timeout
           50ms --initial-rtt-timeout 250ms --max-retries 2 --host-timeout 15m as well as setting the maximum TCP scan
           delay to 5 ms.

       Many Internet pioneers envisioned a global open network with a universal IP address space allowing virtual
       connections between any two nodes. This allows hosts to act as true peers, serving and retrieving information
       from each other. People could access all of their home systems from work, changing the climate control settings
       or unlocking the doors for early guests. This vision of universal connectivity has been stifled by address
       space shortages and security concerns. In the early 1990s, organizations began deploying firewalls for the
       express purpose of reducing connectivity. Huge networks were cordoned off from the unfiltered Internet by
       application proxies, network address translation, and packet filters. The unrestricted flow of information gave
       way to tight regulation of approved communication channels and the content that passes over them.

       Network obstructions such as firewalls can make mapping a network exceedingly difficult. It will not get any
       easier, as stifling casual reconnaissance is often a key goal of implementing the devices. Nevertheless, Nmap
       offers many features to help understand these complex networks, and to verify that filters are working as
       intended. It even supports mechanisms for bypassing poorly implemented defenses. One of the best methods of
       understanding your network security posture is to try to defeat it. Place yourself in the mind-set of an
       attacker, and deploy techniques from this section against your networks. Launch an FTP bounce scan, idle scan,
       fragmentation attack, or try to tunnel through one of your own proxies.

       In addition to restricting network activity, companies are increasingly monitoring traffic with intrusion
       detection systems (IDS). All of the major IDSs ship with rules designed to detect Nmap scans because scans are
       sometimes a precursor to attacks. Many of these products have recently morphed into intrusion prevention
       systems (IPS).  that actively block traffic deemed malicious. Unfortunately for network administrators and IDS
       vendors, reliably detecting bad intentions by analyzing packet data is a tough problem. Attackers with
       patience, skill, and the help of certain Nmap options can usually pass by IDSs undetected. Meanwhile,
       administrators must cope with large numbers of false positive results where innocent activity is misdiagnosed
       and alerted on or blocked.

       Occasionally people suggest that Nmap should not offer features for evading firewall rules or sneaking past
       IDSs. They argue that these features are just as likely to be misused by attackers as used by administrators to
       enhance security. The problem with this logic is that these methods would still be used by attackers, who would
       just find other tools or patch the functionality into Nmap. Meanwhile, administrators would find it that much
       harder to do their jobs. Deploying only modern, patched FTP servers is a far more powerful defense than trying
       to prevent the distribution of tools implementing the FTP bounce attack.

       There is no magic bullet (or Nmap option) for detecting and subverting firewalls and IDS systems. It takes
       skill and experience. A tutorial is beyond the scope of this reference guide, which only lists the relevant
       options and describes what they do.

       -f (fragment packets); --mtu (using the specified MTU) .
           The -f option causes the requested scan (including ping scans) to use tiny fragmented IP packets. The idea
           is to split up the TCP header over several packets to make it harder for packet filters, intrusion
           detection systems, and other annoyances to detect what you are doing. Be careful with this! Some programs
           have trouble handling these tiny packets. The old-school sniffer named Sniffit segmentation faulted
           immediately upon receiving the first fragment. Specify this option once, and Nmap splits the packets into
           eight bytes or less after the IP header. So a 20-byte TCP header would be split into three packets. Two
           with eight bytes of the TCP header, and one with the final four. Of course each fragment also has an IP
           header. Specify -f again to use 16 bytes per fragment (reducing the number of fragments)..  Or you can
           specify your own offset size with the --mtu option. Don't also specify -f if you use --mtu. The offset must
           be a multiple of eight. While fragmented packets won't get by packet filters and firewalls that queue all
           IP fragments, such as the CONFIG_IP_ALWAYS_DEFRAG option in the Linux kernel, some networks can't afford
           the performance hit this causes and thus leave it disabled. Others can't enable this because fragments may
           take different routes into their networks. Some source systems defragment outgoing packets in the kernel.
           Linux with the iptables.  connection tracking module is one such example. Do a scan while a sniffer such as
           Wireshark.  is running to ensure that sent packets are fragmented. If your host OS is causing problems, try
           the --send-eth.  option to bypass the IP layer and send raw ethernet frames.

           Fragmentation is only supported for Nmap's raw packet features, which includes TCP and UDP port scans
           (except connect scan and FTP bounce scan) and OS detection. Features such as version detection and the Nmap
           Scripting Engine generally don't support fragmentation because they rely on your host's TCP stack to
           communicate with target services.

       -D decoy1[,decoy2][,ME][,...] (Cloak a scan with decoys) .
           Causes a decoy scan to be performed, which makes it appear to the remote host that the host(s) you specify
           as decoys are scanning the target network too. Thus their IDS might report 5-10 port scans from unique IP
           addresses, but they won't know which IP was scanning them and which were innocent decoys. While this can be
           defeated through router path tracing, response-dropping, and other active mechanisms, it is generally an
           effective technique for hiding your IP address.

           Separate each decoy host with commas, and you can optionally use ME.  as one of the decoys to represent the
           position for your real IP address. If you put ME in the sixth position or later, some common port scan
           detectors (such as Solar Designer's.  excellent Scanlogd).  are unlikely to show your IP address at all. If
           you don't use ME, Nmap will put you in a random position. You can also use RND.  to generate a random,
           non-reserved IP address, or RND:number to generate number addresses.

           Note that the hosts you use as decoys should be up or you might accidentally SYN flood your targets. Also
           it will be pretty easy to determine which host is scanning if only one is actually up on the network. You
           might want to use IP addresses instead of names (so the decoy networks don't see you in their nameserver

           Decoys are used both in the initial ping scan (using ICMP, SYN, ACK, or whatever) and during the actual
           port scanning phase. Decoys are also used during remote OS detection (-O). Decoys do not work with version
           detection or TCP connect scan. When a scan delay is in effect, the delay is enforced between each batch of
           spoofed probes, not between each individual probe. Because decoys are sent as a batch all at once, they may
           temporarily violate congestion control limits.

           It is worth noting that using too many decoys may slow your scan and potentially even make it less
           accurate. Also, some ISPs will filter out your spoofed packets, but many do not restrict spoofed IP packets
           at all.

       -S IP_Address (Spoof source address) .
           In some circumstances, Nmap may not be able to determine your source address (Nmap will tell you if this is
           the case). In this situation, use -S with the IP address of the interface you wish to send packets through.

           Another possible use of this flag is to spoof the scan to make the targets think that someone else is
           scanning them. Imagine a company being repeatedly port scanned by a competitor! The -e option and -Pn are
           generally required for this sort of usage. Note that you usually won't receive reply packets back (they
           will be addressed to the IP you are spoofing), so Nmap won't produce useful reports.

       -e interface (Use specified interface) .
           Tells Nmap what interface to send and receive packets on. Nmap should be able to detect this automatically,
           but it will tell you if it cannot.

       --source-port portnumber; -g portnumber (Spoof source port number) .
           One surprisingly common misconfiguration is to trust traffic based only on the source port number. It is
           easy to understand how this comes about. An administrator will set up a shiny new firewall, only to be
           flooded with complains from ungrateful users whose applications stopped working. In particular, DNS may be
           broken because the UDP DNS replies from external servers can no longer enter the network. FTP is another
           common example. In active FTP transfers, the remote server tries to establish a connection back to the
           client to transfer the requested file.

           Secure solutions to these problems exist, often in the form of application-level proxies or
           protocol-parsing firewall modules. Unfortunately there are also easier, insecure solutions. Noting that DNS
           replies come from port 53 and active FTP from port 20, many administrators have fallen into the trap of
           simply allowing incoming traffic from those ports. They often assume that no attacker would notice and
           exploit such firewall holes. In other cases, administrators consider this a short-term stop-gap measure
           until they can implement a more secure solution. Then they forget the security upgrade.

           Overworked network administrators are not the only ones to fall into this trap. Numerous products have
           shipped with these insecure rules. Even Microsoft has been guilty. The IPsec filters that shipped with
           Windows 2000 and Windows XP contain an implicit rule that allows all TCP or UDP traffic from port 88
           (Kerberos). In another well-known case, versions of the Zone Alarm personal firewall up to 2.1.25 allowed
           any incoming UDP packets with the source port 53 (DNS) or 67 (DHCP).

           Nmap offers the -g and --source-port options (they are equivalent) to exploit these weaknesses. Simply
           provide a port number and Nmap will send packets from that port where possible. Most scanning operations
           that use raw sockets, including SYN and UDP scans, support the option completely. The option notably
           doesn't have an effect for any operations that use normal operating system sockets, including DNS requests,
           TCP connect scan,.  version detection, and script scanning. Setting the source port also doesn't work for
           OS detection, because Nmap must use different port numbers for certain OS detection tests to work properly.

       --data-length number (Append random data to sent packets) .
           Normally Nmap sends minimalist packets containing only a header. So its TCP packets are generally 40 bytes
           and ICMP echo requests are just 28. Some UDP ports.  and IP protocols.  get a custom payload by default.
           This option tells Nmap to append the given number of random bytes to most of the packets it sends, and not
           to use any protocol-specific payloads. (Use --data-length 0 for no random or protocol-specific payloads..
           OS detection (-O) packets are not affected.  because accuracy there requires probe consistency, but most
           pinging and portscan packets support this. It slows things down a little, but can make a scan slightly less

       --ip-options S|R [route]|L [route]|T|U ... ; --ip-options hex string (Send packets with specified ip options) .
           The IP protocol[13] offers several options which may be placed in packet headers. Unlike the ubiquitous TCP
           options, IP options are rarely seen due to practicality and security concerns. In fact, many Internet
           routers block the most dangerous options such as source routing. Yet options can still be useful in some
           cases for determining and manipulating the network route to target machines. For example, you may be able
           to use the record route option to determine a path to a target even when more traditional traceroute-style
           approaches fail. Or if your packets are being dropped by a certain firewall, you may be able to specify a
           different route with the strict or loose source routing options.

           The most powerful way to specify IP options is to simply pass in values as the argument to --ip-options.
           Precede each hex number with \x then the two digits. You may repeat certain characters by following them
           with an asterisk and then the number of times you wish them to repeat. For example, \x01\x07\x04\x00*36\x01
           is a hex string containing 36 NUL bytes.

           Nmap also offers a shortcut mechanism for specifying options. Simply pass the letter R, T, or U to request
           record-route,.  record-timestamp,.  or both options together, respectively. Loose or strict source routing.
           may be specified with an L or S followed by a space and then a space-separated list of IP addresses.

           If you wish to see the options in packets sent and received, specify --packet-trace. For more information
           and examples of using IP options with Nmap, see

       --ttl value (Set IP time-to-live field) .
           Sets the IPv4 time-to-live field in sent packets to the given value.

       --randomize-hosts (Randomize target host order) .
           Tells Nmap to shuffle each group of up to 16384 hosts before it scans them. This can make the scans less
           obvious to various network monitoring systems, especially when you combine it with slow timing options. If
           you want to randomize over larger group sizes, increase PING_GROUP_SZ.  in nmap.h.  and recompile. An
           alternative solution is to generate the target IP list with a list scan (-sL -n -oN filename), randomize it
           with a Perl script, then provide the whole list to Nmap with -iL..

       --spoof-mac MAC address, prefix, or vendor name (Spoof MAC address) .
           Asks Nmap to use the given MAC address for all of the raw ethernet frames it sends. This option implies
           --send-eth.  to ensure that Nmap actually sends ethernet-level packets. The MAC given can take several
           formats. If it is simply the number 0, Nmap chooses a completely random MAC address for the session. If the
           given string is an even number of hex digits (with the pairs optionally separated by a colon), Nmap will
           use those as the MAC. If fewer than 12 hex digits are provided, Nmap fills in the remainder of the six
           bytes with random values. If the argument isn't a zero or hex string, Nmap looks through nmap-mac-prefixes
           to find a vendor name containing the given string (it is case insensitive). If a match is found, Nmap uses
           the vendor's OUI (three-byte prefix).  and fills out the remaining three bytes randomly. Valid --spoof-mac
           argument examples are Apple, 0, 01:02:03:04:05:06, deadbeefcafe, 0020F2, and Cisco. This option only
           affects raw packet scans such as SYN scan or OS detection, not connection-oriented features such as version
           detection or the Nmap Scripting Engine.

       --badsum (Send packets with bogus TCP/UDP checksums) .
           Asks Nmap to use an invalid TCP, UDP or SCTP checksum for packets sent to target hosts. Since virtually all
           host IP stacks properly drop these packets, any responses received are likely coming from a firewall or IDS
           that didn't bother to verify the checksum. For more details on this technique, see

       --adler32 (Use deprecated Adler32 instead of CRC32C for SCTP checksums) .
           Asks Nmap to use the deprecated Adler32 algorithm for calculating the SCTP checksum. If --adler32 is not
           given, CRC-32C (Castagnoli) is used.  RFC 2960[14] originally defined Adler32 as checksum algorithm for
           SCTP; RFC 4960[7] later redefined the SCTP checksums to use CRC-32C. Current SCTP implementations should be
           using CRC-32C, but in order to elicit responses from old, legacy SCTP implementations, it may be preferable
           to use Adler32.

       Any security tool is only as useful as the output it generates. Complex tests and algorithms are of little
       value if they aren't presented in an organized and comprehensible fashion. Given the number of ways Nmap is
       used by people and other software, no single format can please everyone. So Nmap offers several formats,
       including the interactive mode for humans to read directly and XML for easy parsing by software.

       In addition to offering different output formats, Nmap provides options for controlling the verbosity of output
       as well as debugging messages. Output types may be sent to standard output or to named files, which Nmap can
       append to or clobber. Output files may also be used to resume aborted scans.

       Nmap makes output available in five different formats. The default is called interactive output,.  and it is
       sent to standard output (stdout)..  There is also normal output,.  which is similar to interactive except that
       it displays less runtime information and warnings since it is expected to be analyzed after the scan completes
       rather than interactively.

       XML output.  is one of the most important output types, as it can be converted to HTML, easily parsed by
       programs such as Nmap graphical user interfaces, or imported into databases.

       The two remaining output types are the simple grepable output.  which includes most information for a target
       host on a single line, and sCRiPt KiDDi3 0utPUt.  for users who consider themselves |<-r4d.

       While interactive output is the default and has no associated command-line options, the other four format
       options use the same syntax. They take one argument, which is the filename that results should be stored in.
       Multiple formats may be specified, but each format may only be specified once. For example, you may wish to
       save normal output for your own review while saving XML of the same scan for programmatic analysis. You might
       do this with the options -oX myscan.xml -oN myscan.nmap. While this chapter uses the simple names like
       myscan.xml for brevity, more descriptive names are generally recommended. The names chosen are a matter of
       personal preference, though I use long ones that incorporate the scan date and a word or two describing the
       scan, placed in a directory named after the company I'm scanning.

       While these options save results to files, Nmap still prints interactive output to stdout as usual. For
       example, the command nmap -oX myscan.xml target prints XML to myscan.xml and fills standard output with the
       same interactive results it would have printed if -oX wasn't specified at all. You can change this by passing a
       hyphen character as the argument to one of the format types. This causes Nmap to deactivate interactive output,
       and instead print results in the format you specified to the standard output stream. So the command nmap -oX -
       target will send only XML output to stdout..  Serious errors may still be printed to the normal error stream,

       Unlike some Nmap arguments, the space between the logfile option flag (such as -oX) and the filename or hyphen
       is mandatory. If you omit the flags and give arguments such as -oG- or -oXscan.xml, a backwards compatibility
       feature of Nmap will cause the creation of normal format output files named G- and Xscan.xml respectively.

       All of these arguments support strftime-like.  conversions in the filename.  %H, %M, %S, %m, %d, %y, and %Y are
       all exactly the same as in strftime.  %T is the same as %H%M%S, %R is the same as %H%M, and %D is the same as
       %m%d%y. A % followed by any other character just yields that character (%% gives you a percent symbol). So -oX
       'scan-%T-%D.xml' will use an XML file with a name in the form of scan-144840-121307.xml.

       Nmap also offers options to control scan verbosity and to append to output files rather than clobbering them.
       All of these options are described below.

       Nmap Output Formats

       -oN filespec (normal output) .
           Requests that normal output be directed to the given filename. As discussed above, this differs slightly
           from interactive output.

       -oX filespec (XML output) .
           Requests that XML output be directed to the given filename. Nmap includes a document type definition (DTD)
           which allows XML parsers to validate Nmap XML output. While it is primarily intended for programmatic use,
           it can also help humans interpret Nmap XML output. The DTD defines the legal elements of the format, and
           often enumerates the attributes and values they can take on. The latest version is always available from

           XML offers a stable format that is easily parsed by software. Free XML parsers are available for all major
           computer languages, including C/C++, Perl, Python, and Java. People have even written bindings for most of
           these languages to handle Nmap output and execution specifically. Examples are Nmap::Scanner[15].  and
           Nmap::Parser[16].  in Perl CPAN. In almost all cases that a non-trivial application interfaces with Nmap,
           XML is the preferred format.

           The XML output references an XSL stylesheet which can be used to format the results as HTML. The easiest
           way to use this is simply to load the XML output in a web browser such as Firefox or IE. By default, this
           will only work on the machine you ran Nmap on (or a similarly configured one) due to the hard-coded
           nmap.xsl filesystem path. Use the --webxml or --stylesheet options to create portable XML files that render
           as HTML on any web-connected machine.

       -oS filespec (ScRipT KIdd|3 oUTpuT) .
           Script kiddie output is like interactive output, except that it is post-processed to better suit the l33t
           HaXXorZ who previously looked down on Nmap due to its consistent capitalization and spelling. Humor
           impaired people should note that this option is making fun of the script kiddies before flaming me for
           supposedly "helping them".

       -oG filespec (grepable output) .
           This output format is covered last because it is deprecated. The XML output format is far more powerful,
           and is nearly as convenient for experienced users. XML is a standard for which dozens of excellent parsers
           are available, while grepable output is my own simple hack. XML is extensible to support new Nmap features
           as they are released, while I often must omit those features from grepable output for lack of a place to
           put them.

           Nevertheless, grepable output is still quite popular. It is a simple format that lists each host on one
           line and can be trivially searched and parsed with standard Unix tools such as grep, awk, cut, sed, diff,
           and Perl. Even I usually use it for one-off tests done at the command line. Finding all the hosts with the
           SSH port open or that are running Solaris takes only a simple grep to identify the hosts, piped to an awk
           or cut command to print the desired fields.

           Grepable output consists of comments (lines starting with a pound (#)).  and target lines. A target line
           includes a combination of six labeled fields, separated by tabs and followed with a colon. The fields are
           Host, Ports, Protocols, Ignored State, OS, Seq Index, IP ID, and Status.

           The most important of these fields is generally Ports, which gives details on each interesting port. It is
           a comma separated list of port entries. Each port entry represents one interesting port, and takes the form
           of seven slash (/) separated subfields. Those subfields are: Port number, State, Protocol, Owner, Service,
           SunRPC info, and Version info.

           As with XML output, this man page does not allow for documenting the entire format. A more detailed look at
           the Nmap grepable output format is available from

       -oA basename (Output to all formats) .
           As a convenience, you may specify -oA basename to store scan results in normal, XML, and grepable formats
           at once. They are stored in basename.nmap, basename.xml, and basename.gnmap, respectively. As with most
           programs, you can prefix the filenames with a directory path, such as ~/nmaplogs/foocorp/ on Unix or
           c:\hacking\sco on Windows.

       Verbosity and debugging options

       -v (Increase verbosity level) .
           Increases the verbosity level, causing Nmap to print more information about the scan in progress. Open
           ports are shown as they are found and completion time estimates are provided when Nmap thinks a scan will
           take more than a few minutes. Use it twice or more for even greater verbosity: -vv, or give a verbosity
           level directly, for example -v3..

           Most changes only affect interactive output, and some also affect normal and script kiddie output. The
           other output types are meant to be processed by machines, so Nmap can give substantial detail by default in
           those formats without fatiguing a human user. However, there are a few changes in other modes where output
           size can be reduced substantially by omitting some detail. For example, a comment line in the grepable
           output that provides a list of all ports scanned is only printed in verbose mode because it can be quite

       -d (Increase debugging level) .
           When even verbose mode doesn't provide sufficient data for you, debugging is available to flood you with
           much more! As with the verbosity option (-v), debugging is enabled with a command-line flag (-d) and the
           debug level can be increased by specifying it multiple times,.  as in -dd, or by setting a level directly.
           For example, -d9 sets level nine. That is the highest effective level and will produce thousands of lines
           unless you run a very simple scan with very few ports and targets.

           Debugging output is useful when a bug is suspected in Nmap, or if you are simply confused as to what Nmap
           is doing and why. As this feature is mostly intended for developers, debug lines aren't always
           self-explanatory. You may get something like: Timeout vals: srtt: -1 rttvar: -1 to: 1000000 delta 14987 ==>
           srtt: 14987 rttvar: 14987 to: 100000. If you don't understand a line, your only recourses are to ignore it,
           look it up in the source code, or request help from the development list (nmap-dev)..  Some lines are self
           explanatory, but the messages become more obscure as the debug level is increased.

       --reason (Host and port state reasons) .
           Shows the reason each port is set to a specific state and the reason each host is up or down. This option
           displays the type of the packet that determined a port or hosts state. For example, A RST packet from a
           closed port or an echo reply from an alive host. The information Nmap can provide is determined by the type
           of scan or ping. The SYN scan and SYN ping (-sS and -PS) are very detailed, but the TCP connect scan (-sT)
           is limited by the implementation of the connect system call. This feature is automatically enabled by the
           debug option (-d).  and the results are stored in XML log files even if this option is not specified.

       --stats-every time (Print periodic timing stats) .
           Periodically prints a timing status message after each interval of time. The time is a specification of the
           kind described in the section called "TIMING AND PERFORMANCE"; so for example, use --stats-every 10s to get
           a status update every 10 seconds. Updates are printed to interactive output (the screen) and XML output.

       --packet-trace (Trace packets and data sent and received) .
           Causes Nmap to print a summary of every packet sent or received. This is often used for debugging, but is
           also a valuable way for new users to understand exactly what Nmap is doing under the covers. To avoid
           printing thousands of lines, you may want to specify a limited number of ports to scan, such as -p20-30. If
           you only care about the goings on of the version detection subsystem, use --version-trace instead. If you
           only care about script tracing, specify --script-trace. With --packet-trace, you get all of the above.

       --open (Show only open (or possibly open) ports) .
           Sometimes you only care about ports you can actually connect to (open ones), and don't want results
           cluttered with closed, filtered, and closed|filtered ports. Output customization is normally done after the
           scan using tools such as grep, awk, and Perl, but this feature was added due to overwhelming requests.
           Specify --open to only see hosts with at least one open, open|filtered, or unfiltered port, and only see
           ports in those states. These three states are treated just as they normally are, which means that
           open|filtered and unfiltered may be condensed into counts if there are an overwhelming number of them.

       --iflist (List interfaces and routes) .
           Prints the interface list and system routes as detected by Nmap. This is useful for debugging routing
           problems or device mischaracterization (such as Nmap treating a PPP connection as ethernet).

       --log-errors (Log errors/warnings to normal mode output file) .
           Warnings and errors printed by Nmap usually go only to the screen (interactive output), leaving any
           normal-format output files (usually specified with -oN) uncluttered. When you do want to see those messages
           in the normal output file you specified, add this option. It is useful when you aren't watching the
           interactive output or when you want to record errors while debugging a problem. The error and warning
           messages will still appear in interactive mode too. This won't work for most errors related to bad
           command-line arguments because Nmap may not have initialized its output files yet. In addition, some Nmap
           error and warning messages use a different system which does not yet support this option.

           An alternative to --log-errors is redirecting interactive output (including the standard error stream) to a
           file. Most Unix shells make this approach easy, though it can be difficult on Windows.

       Miscellaneous output options

       --append-output (Append to rather than clobber output files) .
           When you specify a filename to an output format flag such as -oX or -oN, that file is overwritten by
           default. If you prefer to keep the existing content of the file and append the new results, specify the
           --append-output option. All output filenames specified in that Nmap execution will then be appended to
           rather than clobbered. This doesn't work well for XML (-oX) scan data as the resultant file generally won't
           parse properly until you fix it up by hand.

       --resume filename (Resume aborted scan) .
           Some extensive Nmap runs take a very long time--on the order of days. Such scans don't always run to
           completion. Restrictions may prevent Nmap from being run during working hours, the network could go down,
           the machine Nmap is running on might suffer a planned or unplanned reboot, or Nmap itself could crash. The
           administrator running Nmap could cancel it for any other reason as well, by pressing ctrl-C. Restarting the
           whole scan from the beginning may be undesirable. Fortunately, if normal (-oN) or grepable (-oG) logs were
           kept, the user can ask Nmap to resume scanning with the target it was working on when execution ceased.
           Simply specify the --resume option and pass the normal/grepable output file as its argument. No other
           arguments are permitted, as Nmap parses the output file to use the same ones specified previously. Simply
           call Nmap as nmap --resume logfilename. Nmap will append new results to the data files specified in the
           previous execution. Resumption does not support the XML output format because combining the two runs into
           one valid XML file would be difficult.

       --stylesheet path or URL (Set XSL stylesheet to transform XML output) .
           Nmap ships with an XSL.  stylesheet.  named nmap.xsl.  for viewing or translating XML output to HTML..  The
           XML output includes an xml-stylesheet directive which points to nmap.xml where it was initially installed
           by Nmap. Run the XML file through an XSLT processor such as xsltproc[17].  to produce an HTML file.
           Directly opening the XML file in a browser no longer works well because modern browsers limit the locations
           a stylesheet may be loaded from. If you wish to use a different stylesheet, specify it as the argument to
           --stylesheet. You must pass the full pathname or URL. One common invocation is --stylesheet
  This tells an XSLT processor to load the latest version of the
           stylesheet from Nmap.Org. The --webxml option does the same thing with less typing and memorization.
           Loading the XSL from Nmap.Org makes it easier to view results on a machine that doesn't have Nmap (and thus
           nmap.xsl) installed. So the URL is often more useful, but the local filesystem location of nmap.xsl is used
           by default for privacy reasons.

       --webxml (Load stylesheet from Nmap.Org) .
           This is a convenience option, nothing more than an alias for --stylesheet

       --no-stylesheet (Omit XSL stylesheet declaration from XML) .
           Specify this option to prevent Nmap from associating any XSL stylesheet with its XML output. The
           xml-stylesheet directive is omitted.

       This section describes some important (and not-so-important) options that don't really fit anywhere else.

       -6 (Enable IPv6 scanning) .
           Since 2002, Nmap has offered IPv6 support for its most popular features. In particular, ping scanning
           (TCP-only), connect scanning, and version detection all support IPv6. The command syntax is the same as
           usual except that you also add the -6 option. Of course, you must use IPv6 syntax if you specify an address
           rather than a hostname. An address might look like 3ffe:7501:4819:2000:210:f3ff:fe03:14d0, so hostnames are
           recommended. The output looks the same as usual, with the IPv6 address on the "interesting ports" line
           being the only IPv6 giveaway.

           While IPv6 hasn't exactly taken the world by storm, it gets significant use in some (usually Asian)
           countries and most modern operating systems support it. To use Nmap with IPv6, both the source and target
           of your scan must be configured for IPv6. If your ISP (like most of them) does not allocate IPv6 addresses
           to you, free tunnel brokers are widely available and work fine with Nmap. I use the free IPv6 tunnel
           broker.  service at Other tunnel brokers are listed at Wikipedia[18]. 6to4
           tunnels are another popular, free approach.

       -A (Aggressive scan options) .
           This option enables additional advanced and aggressive options. I haven't decided exactly which it stands
           for yet. Presently this enables OS detection (-O), version scanning (-sV), script scanning (-sC) and
           traceroute (--traceroute)..  More features may be added in the future. The point is to enable a
           comprehensive set of scan options without people having to remember a large set of flags. However, because
           script scanning with the default set is considered intrusive, you should not use -A against target networks
           without permission. This option only enables features, and not timing options (such as -T4) or verbosity
           options (-v) that you might want as well.

       --datadir directoryname (Specify custom Nmap data file location) .
           Nmap obtains some special data at runtime in files named nmap-service-probes, nmap-services,
           nmap-protocols, nmap-rpc, nmap-mac-prefixes, and nmap-os-db. If the location of any of these files has been
           specified (using the --servicedb or --versiondb options), that location is used for that file. After that,
           Nmap searches these files in the directory specified with the --datadir option (if any). Any files not
           found there, are searched for in the directory specified by the NMAPDIR.  environment variable. Next comes
           ~/.nmap.  for real and effective UIDs (POSIX systems only) or location of the Nmap executable (Win32 only),
           and then a compiled-in location such as /usr/local/share/nmap or /usr/share/nmap . As a last resort, Nmap
           will look in the current directory.

       --servicedb services file (Specify custom services file) .
           Asks Nmap to use the specified services file rather than the nmap-services data file that comes with Nmap.
           Using this option also causes a fast scan (-F) to be used. See the description for --datadir for more
           information on Nmap's data files.

       --versiondb service probes file (Specify custom service probes file) .
           Asks Nmap to use the specified service probes file rather than the nmap-service-probes data file that comes
           with Nmap. See the description for --datadir for more information on Nmap's data files.

       --send-eth (Use raw ethernet sending) .
           Asks Nmap to send packets at the raw ethernet (data link) layer rather than the higher IP (network) layer.
           By default, Nmap chooses the one which is generally best for the platform it is running on. Raw sockets (IP
           layer).  are generally most efficient for Unix machines, while ethernet frames are required for Windows
           operation since Microsoft disabled raw socket support. Nmap still uses raw IP packets on Unix despite this
           option when there is no other choice (such as non-ethernet connections).

       --send-ip (Send at raw IP level) .
           Asks Nmap to send packets via raw IP sockets rather than sending lower level ethernet frames. It is the
           complement to the --send-eth option discussed previously.

       --privileged (Assume that the user is fully privileged) .
           Tells Nmap to simply assume that it is privileged enough to perform raw socket sends, packet sniffing, and
           similar operations that usually require root privileges.  on Unix systems. By default Nmap quits if such
           operations are requested but geteuid is not zero.  --privileged is useful with Linux kernel capabilities
           and similar systems that may be configured to allow unprivileged users to perform raw-packet scans. Be sure
           to provide this option flag before any flags for options that require privileges (SYN scan, OS detection,
           etc.). The NMAP_PRIVILEGED.  environment variable may be set as an equivalent alternative to --privileged.

       --unprivileged (Assume that the user lacks raw socket privileges) .
           This option is the opposite of --privileged. It tells Nmap to treat the user as lacking network raw socket
           and sniffing privileges. This is useful for testing, debugging, or when the raw network functionality of
           your operating system is somehow broken. The NMAP_UNPRIVILEGED.  environment variable may be set as an
           equivalent alternative to --unprivileged.

       --release-memory (Release memory before quitting) .
           This option is only useful for memory-leak debugging. It causes Nmap to release allocated memory just
           before it quits so that actual memory leaks are easier to spot. Normally Nmap skips this as the OS does
           this anyway upon process termination.

       -V; --version (Print version number) .
           Prints the Nmap version number and exits.

       -h; --help (Print help summary page) .
           Prints a short help screen with the most common command flags. Running Nmap without any arguments does the
           same thing.

       During the execution of Nmap, all key presses are captured. This allows you to interact with the program
       without aborting and restarting it. Certain special keys will change options, while any other keys will print
       out a status message telling you about the scan. The convention is that lowercase letters increase the amount
       of printing, and uppercase letters decrease the printing. You may also press '?' for help.

       v / V
           Increase / decrease the verbosity level

       d / D
           Increase / decrease the debugging Level

       p / P
           Turn on / off packet tracing

           Print a runtime interaction help screen

       Anything else
           Print out a status message like this:

               Stats: 0:00:07 elapsed; 20 hosts completed (1 up), 1 undergoing Service Scan
               Service scan Timing: About 33.33% done; ETC: 20:57 (0:00:12 remaining)

       Here are some Nmap usage examples, from the simple and routine to a little more complex and esoteric. Some
       actual IP addresses and domain names are used to make things more concrete. In their place you should
       substitute addresses/names from your own network. While I don't think port scanning other networks is or should
       be illegal, some network administrators don't appreciate unsolicited scanning of their networks and may
       complain. Getting permission first is the best approach.

       For testing purposes, you have permission to scan the host  This permission only includes
       scanning via Nmap and not testing exploits or denial of service attacks. To conserve bandwidth, please do not
       initiate more than a dozen scans against that host per day. If this free scanning target service is abused, it
       will be taken down and Nmap will report Failed to resolve given hostname/IP: These permissions
       also apply to the hosts,, and so on, though those hosts do not currently

       nmap -v

       This option scans all reserved TCP ports on the machine . The -v option enables verbose mode.

       nmap -sS -O

       Launches a stealth SYN scan against each machine that is up out of the 256 IPs on the class C sized network
       where Scanme resides. It also tries to determine what operating system is running on each host that is up and
       running. This requires root privileges because of the SYN scan and OS detection.

       nmap -sV -p 22,53,110,143,4564 198.116.0-255.1-127

       Launches host enumeration and a TCP scan at the first half of each of the 255 possible eight-bit subnets in the
       198.116 class B address space. This tests whether the systems run SSH, DNS, POP3, or IMAP on their standard
       ports, or anything on port 4564. For any of these ports found open, version detection is used to determine what
       application is running.

       nmap -v -iR 100000 -Pn -p 80

       Asks Nmap to choose 100,000 hosts at random and scan them for web servers (port 80). Host enumeration is
       disabled with -Pn since first sending a couple probes to determine whether a host is up is wasteful when you
       are only probing one port on each target host anyway.

       nmap -Pn -p80 -oX logs/pb-port80scan.xml -oG logs/pb-port80scan.gnmap

       This scans 4096 IPs for any web servers (without pinging them) and saves the output in grepable and XML

       While this reference guide details all material Nmap options, it can't fully demonstrate how to apply those
       features to quickly solve real-world tasks. For that, we released Nmap Network Scanning: The Official Nmap
       Project Guide to Network Discovery and Security Scanning.  Topics include subverting firewalls and intrusion
       detection systems, optimizing Nmap performance, and automating common networking tasks with the Nmap Scripting
       Engine. Hints and instructions are provided for common Nmap tasks such as taking network inventory, penetration
       testing, detecting rogue wireless access points, and quashing network worm outbreaks. Examples and diagrams
       show actual communication on the wire. More than half of the book is available free online. See for more information.

       Like its author, Nmap isn't perfect. But you can help make it better by sending bug reports or even writing
       patches. If Nmap doesn't behave the way you expect, first upgrade to the latest version available from If the problem persists, do some research to determine whether it has already been discovered
       and addressed. Try searching for the error message on our search page at or at
       Google. Also try browsing the nmap-dev archives at  Read this full manual page as well.
       If nothing comes of this, mail a bug report to Please include everything you have
       learned about the problem, as well as what version of Nmap you are running and what operating system version it
       is running on. Problem reports and Nmap usage questions sent to are far more likely to be
       answered than those sent to Fyodor directly. If you subscribe to the nmap-dev list before posting, your message
       will bypass moderation and get through more quickly. Subscribe at

       Code patches to fix bugs are even better than bug reports. Basic instructions for creating patch files with
       your changes are available at Patches may be sent to nmap-dev (recommended) or to
       Fyodor directly.

       Gordon "Fyodor" Lyon (

       Hundreds of people have made valuable contributions to Nmap over the years. These are detailed in the
       CHANGELOG.  file which is distributed with Nmap and also available from

   Nmap Copyright and Licensing
       The Nmap Security Scanner is (C) 1996-2011 Insecure.Com LLC. Nmap is also a registered trademark of
       Insecure.Com LLC. This program is free software; you may redistribute and/or modify it under the terms of the
       GNU General Public License as published by the Free Software Foundation; Version 2 with the clarifications and
       exceptions described below. This guarantees your right to use, modify, and redistribute this software under
       certain conditions. If you wish to embed Nmap technology into proprietary software, we sell alternative
       licenses (contact Dozens of software vendors already license Nmap technology such as host
       discovery, port scanning, OS detection, and version detection.

       Note that the GPL places important restrictions on "derived works", yet it does not provide a detailed
       definition of that term. To avoid misunderstandings, we consider an application to constitute a "derivative
       work" for the purpose of this license if it does any of the following:

       ?   Integrates source code from Nmap

       ?   Reads or includes Nmap copyrighted data files, such as nmap-os-db or nmap-service-probes.

       ?   Executes Nmap and parses the results (as opposed to typical shell or execution-menu apps, which simply
           display raw Nmap output and so are not derivative works.)

       ?   Integrates/includes/aggregates Nmap into a proprietary executable installer, such as those produced by

       ?   Links to a library or executes a program that does any of the above.

       The term "Nmap" should be taken to also include any portions or derived works of Nmap. This list is not
       exclusive, but is meant to clarify our interpretation of derived works with some common examples. Our
       interpretation applies only to Nmap--we don't speak for other people's GPL works.

       If you have any questions about the GPL licensing restrictions on using Nmap in non-GPL works, we would be
       happy to help. As mentioned above, we also offer alternative license to integrate Nmap into proprietary
       applications and appliances. These contracts have been sold to many security vendors, and generally include a
       perpetual license as well as providing for priority support and updates as well as helping to fund the
       continued development of Nmap technology. Please email for further information.

       As a special exception to the GPL terms, Insecure.Com LLC grants permission to link the code of this program
       with any version of the OpenSSL library which is distributed under a license identical to that listed in the
       included COPYING.OpenSSL file, and distribute linked combinations including the two..  You must obey the GNU
       GPL in all respects for all of the code used other than OpenSSL. If you modify this file, you may extend this
       exception to your version of the file, but you are not obligated to do so.

       If you received these files with a written license agreement or contract stating terms other than the terms
       above, then that alternative license agreement takes precedence over these comments.

   Creative Commons License for this Nmap Guide
       This Nmap Reference Guide is (C) 2005-2011 Insecure.Com LLC. It is hereby placed under version 3.0 of the
       Creative Commons Attribution License[19]. This allows you redistribute and modify the work as you desire, as
       long as you credit the original source. Alternatively, you may choose to treat this document as falling under
       the same license as Nmap itself (discussed previously).

   Source Code Availability and Community Contributions
       Source is provided to this software because we believe users have a right to know exactly what a program is
       going to do before they run it. This also allows you to audit the software for security holes (none have been
       found so far).

       Source code also allows you to port Nmap to new platforms, fix bugs, and add new features. You are highly
       encouraged to send your changes to for possible incorporation into the main distribution.
       By sending these changes to Fyodor or one of the Insecure.Org development mailing lists, it is assumed that you
       are offering the Nmap Project (Insecure.Com LLC) the unlimited, non-exclusive right to reuse, modify, and
       relicense the code. Nmap will always be available open source,.  but this is important because the inability to
       relicense code has caused devastating problems for other Free Software projects (such as KDE and NASM). We also
       occasionally relicense the code to third parties as discussed above. If you wish to specify special license
       conditions of your contributions, just say so when you send them.

   No Warranty.
       This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the
       implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
       v2.0 for more details at, or in the COPYING file included with Nmap.

       It should also be noted that Nmap has occasionally been known to crash poorly written applications, TCP/IP
       stacks, and even operating systems..  While this is extremely rare, it is important to keep in mind.  Nmap
       should never be run against mission critical systems unless you are prepared to suffer downtime. We acknowledge
       here that Nmap may crash your systems or networks and we disclaim all liability for any damage or problems Nmap
       could cause.

   Inappropriate Usage
       Because of the slight risk of crashes and because a few black hats like to use Nmap for reconnaissance prior to
       attacking systems, there are administrators who become upset and may complain when their system is scanned.
       Thus, it is often advisable to request permission before doing even a light scan of a network.

       Nmap should never be installed with special privileges (e.g. suid root) for security reasons..

   Third-Party Software
       This product includes software developed by the Apache Software Foundation[20]. A modified version of the
       Libpcap portable packet capture library[21].  is distributed along with Nmap. The Windows version of Nmap
       utilized the Libpcap-derived WinPcap library[22].  instead. Regular expression support is provided by the PCRE
       library[23],.  which is open-source software, written by Philip Hazel..  Certain raw networking functions use
       the Libdnet[24].  networking library, which was written by Dug Song..  A modified version is distributed with
       Nmap. Nmap can optionally link with the OpenSSL cryptography toolkit[25].  for SSL version detection support.
       The Nmap Scripting Engine uses an embedded version of the Lua programming language[26]..  All of the
       third-party software described in this paragraph is freely redistributable under BSD-style software licenses.

       Binary packages for Windows and Mac OS X include support libraries necessary to run Zenmap and Ndiff with
       Python and PyGTK. (Unix platforms commonly make these libraries easy to install, so they are not part of the
       packages.) A listing of these support libraries and their licenses is included in the LICENSES files.

   United States Export Control.
       Nmap only uses encryption when compiled with the optional OpenSSL support and linked with OpenSSL. When
       compiled without OpenSSL support, Insecure.Com LLC believes that Nmap is not subject to U.S.  Export
       Administration Regulations (EAR)[27] export control. As such, there is no applicable ECCN (export control
       classification number) and exportation does not require any special license, permit, or other governmental

       When compiled with OpenSSL support or distributed as source code, Insecure.Com LLC believes that Nmap falls
       under U.S. ECCN 5D002[28] ("Information Security Software"). We distribute Nmap under the TSU exception for
       publicly available encryption software defined in EAR 740.13(e)[29].

        1. Nmap Network Scanning: The Official Nmap Project Guide to Network Discovery and Security Scanning

        2. RFC 1122

        3. RFC 792

        4. RFC 950

        5. RFC 1918

        6. UDP

        7. SCTP

        8. TCP RFC

        9. RFC 959

       10. RFC 1323

       11. Lua programming language

       12. precedence

       13. IP protocol

       14. RFC 2960

       15. Nmap::Scanner

       16. Nmap::Parser

       17. xsltproc

       18. listed at Wikipedia

       19. Creative Commons Attribution License

       20. Apache Software Foundation

       21. Libpcap portable packet capture library

       22. WinPcap library

       23. PCRE library

       24. Libdnet

       25. OpenSSL cryptography toolkit

       26. Lua programming language

       27. Export Administration Regulations (EAR)

       28. 5D002

       29. EAR 740.13(e)

Nmap                              12/12/2011                           NMAP(1)