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.\" References: RFC 2553

.TH INET_NTOP 3 2017-09-15 "Linux" "Linux Programmer's Manual"

.SH NAME

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

.SH SYNOPSIS

.nf

.B #include <arpa/inet.h>

.PP

.BI "const char *inet_ntop(int " "af" ", const void *" "src" ,

.BI "                      char *" "dst" ", socklen_t " "size" );

.fi

.SH DESCRIPTION

This function converts the network address structure

.I src

in the

.I af

address family into a character string.

The resulting string is copied to the buffer pointed to by

.IR dst ,

which must be a non-null pointer.

The caller specifies the number of bytes available in this buffer in

the argument

.IR size .

.PP

.BR inet_ntop ()

extends the

.BR inet_ntoa (3)

function to support multiple address families,

.BR inet_ntoa (3)

is now considered to be deprecated in favor of

.BR inet_ntop ().

The following address families are currently supported:

.TP

.B AF_INET

.I src

points to a

.I struct in_addr

(in network byte order)

which is converted to an IPv4 network address in

the dotted-decimal format, "\fIddd.ddd.ddd.ddd\fP".

The buffer

.I dst

must be at least

.B INET_ADDRSTRLEN

bytes long.

.TP

.B AF_INET6

.I src

points to a

.I 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

.I dst

must be at least

.B INET6_ADDRSTRLEN

bytes long.

.SH RETURN VALUE

On success,

.BR inet_ntop ()

returns a non-null pointer to

.IR dst .

NULL is returned if there was an error, with

.I errno

set to indicate the error.

.SH ERRORS

.TP

.B EAFNOSUPPORT

.I af

was not a valid address family.

.TP

.B ENOSPC

The converted address string would exceed the size given by

.IR size .

.SH ATTRIBUTES

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

.BR attributes (7).

.TS

allbox;

lb lb lb

l l l.

Interface	Attribute	Value

T{

.BR inet_ntop ()

T}	Thread safety	MT-Safe locale

.TE

.sp 1

.SH CONFORMING TO

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

Note that RFC\ 2553 defines a prototype where the last argument

.I size

is of type

.IR size_t .

Many systems follow RFC\ 2553.

Glibc 2.0 and 2.1 have

.IR size_t ,

but 2.2 and later have

.IR socklen_t .

.\" 2.1.3: size_t, 2.1.91: socklen_t

.SH BUGS

.B AF_INET6

converts IPv4-mapped IPv6 addresses into an IPv6 format.

.SH EXAMPLE

See

.BR inet_pton (3).

.SH SEE ALSO

.BR getnameinfo (3),

.BR inet (3),

.BR inet_pton (3)

.SH COLOPHON

This page is part of release 4.15 of the Linux

.I man-pages

project.

A description of the project,

information about reporting bugs,

and the latest version of this page,

can be found at

\%https://www.kernel.org/doc/man\-pages/.