<?php
// reverse-ip.php ---
// Copyright (c) 2010, Denis Sukhonin <d.sukhonin@gmail.com>

if (!isset($_POST['ip']) || !strlen($_POST['ip']))
	return;

$hosts = array_map('gethostbyaddr', explode(';', $_POST['ip']));

header('Content-Type: text/plain; charset=utf8');
echo implode(';', $hosts);

// reverse-ip.php ends here
?>