Subnet Enumeration | www.pemula.info

<?php
function enumerateSubnet()
{
    echo "<h3>Subnet Enumeration:</h3>";
    list($octet1, $octet2, $octet3) = explode(".", $_SERVER['SERVER_ADDR']);
    echo '<table border="1"><tr><td><font color="green"><b>IP Address:</b></font></td><td><font color="blue"><b>Hostname:</b></font></td></tr>';
    $octet4 = 0;
    while($octet4 < 255) {
        $address = $octet1.".".$octet2.".".$octet3.".".$octet4;
        $hostname = @gethostbyaddr($address);
        if($hostname != $address) echo '<tr><td>'.$address.'</td><td>'.$hostname.'</td></tr>';
        $hostname = "";
        $octet4++;
    }
    echo '</table><br><br>';
}
?>