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  dot-
              ted-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  fol-
       low 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 3.25 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)