<?php
ini_set('max_execution_time', 0);
ini_set('memory_limit', -1);
$host = $_GET['host'];
$ports = array();
for ($i = 1; $i < 256 * 256; $i++)
{
    $ports[] = $i;
}
echo "<ul>";
foreach ($ports as $port)
{
    $connection = @fsockopen($host, $port, $errno, $errstr, 2);
    if (is_resource($connection))
    {
        echo '<li style="color:green">' . $host . ':' . $port . ' ' . '(' . getservbyport($port, 'tcp') . ') is open.</li>' . "\n";
        fclose($connection);
    }
    else
    {
        echo '<li>' . $host . ':' . $port . ' is not responding.</li>' . "\n";
    }
}
echo "</ul>";