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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 *restrict src,
char *restrict 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 ad‐
dress 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.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
┌───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┬───────────────┬────────────────┐
│Interface │ Attribute │ Value │
├───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┼───────────────┼────────────────┤
│inet_ntop() │ Thread safety │ MT-Safe locale │
└───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────┴───────────────┴────────────────┘
CONFORMING TO
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 socklen_t.
BUGS
AF_INET6 converts IPv4-mapped IPv6 addresses into an IPv6 format.
EXAMPLES
See inet_pton(3).
SEE ALSO
getnameinfo(3), inet(3), inet_pton(3)
Linux 2021-03-22 INET_NTOP(3)