inet_ntop(3) — Linux manual page


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

NAME         top

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

SYNOPSIS         top

       #include <arpa/inet.h>

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

DESCRIPTION         top

       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

              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.

              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         top

       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         top

              af was not a valid address family.

       ENOSPC The converted address string would exceed the size given by

ATTRIBUTES         top

       For an explanation of the terms used in this section, see

       │Interface   Attribute     Value          │
       │inet_ntop() │ Thread safety │ MT-Safe locale │

CONFORMING TO         top

       POSIX.1-2001, POSIX.1-2008.  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

BUGS         top

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

EXAMPLES         top

       See inet_pton(3).

SEE ALSO         top

       getnameinfo(3), inet(3), inet_pton(3)

COLOPHON         top

       This page is part of release 5.08 of the Linux man-pages project.  A
       description of the project, information about reporting bugs, and the
       latest version of this page, can be found at

Linux                            2020-06-09                     INET_NTOP(3)

Pages that refer to this page: endhostent(3)freehostent(3)gethostbyaddr(3)gethostbyaddr_r(3)gethostbyname2(3)gethostbyname2_r(3)gethostbyname(3)gethostbyname_r(3)gethostent(3)gethostent_r(3)getipnodebyaddr(3)getipnodebyname(3)getnameinfo(3)h_errno(3)herror(3)hstrerror(3)inet(3)inet_addr(3)inet_aton(3)inet_lnaof(3)inet_makeaddr(3)inet_netof(3)inet_network(3)inet_ntoa(3)inet_pton(3)sethostent(3)