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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 specifies 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  considered 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 3.53 of the Linux man-pages project.  A description of the
       project,    and    information    about    reporting    bugs,    can    be    found     at
       http://www.kernel.org/doc/man-pages/.



Linux                                       2008-11-11                               INET_NTOP(3)


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