gethostbyaddr

(PHP 4, PHP 5)

gethostbyaddr — Get the Internet host name corresponding to a given IP address

string gethostbyaddr ( string $ip_address )

Returns the host name of the Internet host specified by ip_address.

Returns the host name on success, the unmodified ip_address on failure, or FALSE on malformed input.

Example #1 A simple gethostbyaddr() example


<?php
$hostname = gethostbyaddr($_SERVER['REMOTE_ADDR']);

echo $hostname;
?>

gethostbyname() - Get the IPv4 address corresponding to a given Internet host name
gethostbynamel() - Get a list of IPv4 addresses corresponding to a given Internet host name