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INET_NTOP(3)               Linux Programmer's Manual              INET_NTOP(3)



NAME
       inet_ntop - convert IPv4 and IPv6 addresses from binary to text form

SYNOPSIS
       #include <arpa/inet.h>

       const char *inet_ntop(int af, const void *src,
                             char *dst, socklen_t size);

DESCRIPTION
       This function converts the network address structure src in the af address family into a character string.  The
       resulting string is copied to the buffer pointed to by dst, which must be a non-NULL pointer.  The caller spec-
       ifies the number of bytes available in this buffer in the argument size.

       inet_ntop() extends the inet_ntoa(3) function to support multiple address families, inet_ntoa(3) is now consid-
       ered to be deprecated in favor of inet_ntop().  The following address families are currently supported:

       AF_INET
              src points to a struct in_addr (in network byte order) which is converted to an IPv4 network address  in
              the  dotted-decimal  format,  "ddd.ddd.ddd.ddd".   The buffer dst must be at least INET_ADDRSTRLEN bytes
              long.

       AF_INET6
              src points to a struct in6_addr (in network byte order) which is converted to a representation  of  this
              address in the most appropriate IPv6 network address format for this address.  The buffer dst must be at
              least INET6_ADDRSTRLEN bytes long.

RETURN VALUE
       On success, inet_ntop() returns a non-null pointer to dst.  NULL is returned if there was an error, with  errno
       set to indicate the error.

ERRORS
       EAFNOSUPPORT
              af was not a valid address family.

       ENOSPC The converted address string would exceed the size given by size.

CONFORMING TO
       POSIX.1-2001.   Note  that  RFC 2553  defines a prototype where the last argument size is of type size_t.  Many
       systems follow RFC 2553.  Glibc 2.0 and 2.1 have size_t, but 2.2 and later have socklen_t.

BUGS
       AF_INET6 converts IPv4-mapped IPv6 addresses into an IPv6 format.

EXAMPLE
       See inet_pton(3).

SEE ALSO
       getnameinfo(3), inet(3), inet_pton(3)

COLOPHON
       This page is part of release 3.22 of the Linux man-pages project.  A description of the project,  and  informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



Linux                             2008-11-11                      INET_NTOP(3)