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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | HISTORY | BUGS | EXAMPLES | SEE ALSO | COLOPHON |
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inet_ntop(3) Library Functions Manual inet_ntop(3)
inet_ntop - convert IPv4 and IPv6 addresses from binary to text
form
Standard C library (libc, -lc)
#include <arpa/inet.h>
const char *inet_ntop(socklen_t size;
int af, const void *restrict src,
char dst[restrict size], socklen_t size);
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.
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.
EAFNOSUPPORT
af was not a valid address family.
ENOSPC The converted address string would exceed the size given by
size.
For an explanation of the terms used in this section, see
attributes(7).
┌───────────────────────────────┬───────────────┬────────────────┐
│ Interface │ Attribute │ Value │
├───────────────────────────────┼───────────────┼────────────────┤
│ inet_ntop() │ Thread safety │ MT-Safe locale │
└───────────────────────────────┴───────────────┴────────────────┘
POSIX.1-2008.
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.
AF_INET6 converts IPv4-mapped IPv6 addresses into an IPv6 format.
See inet_pton(3).
getnameinfo(3), inet(3), inet_pton(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.15.tar.gz
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⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-08-11. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
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improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
[email protected]
Linux man-pages 6.15 2025-06-28 inet_ntop(3)
Pages that refer to this page: gethostbyname(3), getipnodebyname(3), getnameinfo(3), inet(3), inet_pton(3)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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