```{index} single: inet_ntoa; Socket function ``` ```{index} single: Socket::inet_ntoa; Perl function ``` # inet_ntoa Turn a 4-byte packed IPv4 address back into a dotted-quad string. ## Synopsis ```perl my $str = inet_ntoa($packed_ipv4); ``` ## What you get back A string like `"192.0.2.1"`, or `undef` if the input is shorter than 4 bytes. ## Examples ```perl print inet_ntoa(INADDR_LOOPBACK); # 127.0.0.1 ``` ```perl my ($port, $ip) = unpack_sockaddr_in($peer); printf "%s:%d\n", inet_ntoa($ip), $port; ``` ## Edge cases - Input shorter than 4 bytes returns `undef`. - Input longer than 4 bytes: the extra bytes are ignored. ## Differences from upstream Fully compatible with upstream Socket. ## See also - `inet_aton` — reverse direction, string to packed bytes. - `inet_ntop` — same idea for IPv4 or IPv6, parameterised by family. - `unpack_sockaddr_in` — usually the producer of the packed address.