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IPCALC(1)                                                            IPCALC(1)



NAME
       ipcalc - perform simple manipulation of IP addresses

SYNOPSIS
       ipcalc [OPTION]... <IP address>[/prefix] [netmask]


DESCRIPTION
       ipcalc provides a simple way to calculate IP information for a host.  The various options specify what informa-
       tion ipcalc should display on standard out. Multiple options may be specified.  An IP  address  to  operate  on
       must always be specified.  Most operations also require a netmask or a CIDR prefix as well.


OPTIONS
       -c, --check
              Validate  the  IP address under the specified family.  If no address family is specified, IPv4 is
              assumed.


       -4, --ipv4
              Specify IPv4 address family (default).


       -6, --ipv6
              Specify IPv6 address family.


       -b, --broadcast
              Display the broadcast address for the given IP address and netmask.


       -h, --hostname
              Display the hostname for the given IP address.


       -m, --netmask
              Calculate the netmask for the given IP address. It assumes that the IP address is in  a  complete
              class  A,  B, or C network. Many networks do not use the default netmasks, in which case an inap-
              propriate value will be returned.


       -p, --prefix
              Show the prefix for the given mask/IP address.


       -n, --network
              Display the network address for the given IP address and netmask.


       -s, --silent
              Don't ever display error messages.


AUTHORS
       Erik Troan <ewtATredhat.com>
       Preston Brown <pbrownATredhat.com>


       IPv6 supported wedged in by David Cantrell <dcantrellATredhat.com>

REPORTING BUGS
       Report bugs at http://bugzilla.redhat.com/

COPYRIGHT
       Copyright (C) 1997-2008 Red Hat, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even  for  MER-
       CHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.



Red Hat, Inc.                    April 30 2001                       IPCALC(1)