Grab website From IP

<?php
// Grab website From IP.
// by tu5b0l3d
// thx magelang6etar
// http://www.indoxploit.or.id/2016/12/massive-grab-website-from-ip.html

//example: 31.170.164 same with 31.170.164.1-254


$ip = "31.170.164";
for($i=1;$i<=254;$i++){
    echo "$ip.$i\n";
$curl = curl_init();
curl_setopt_array($curl, array(
    CURLOPT_RETURNTRANSFER => 1,
    CURLOPT_URL => "http://reverseip.domaintools.com/search/?q=$ip.$i",
    CURLOPT_USERAGENT => 'Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20140722 Firefox/24.0 Iceweasel/24.7.0'
));
$resp = curl_exec($curl);
curl_close($curl);
preg_match("/<span title=\"$ip.$i\">(.*?)<\/span><\/td>/i", $resp, $domains);
    $su = "$domains[1]";
    echo "$su\n";
    file_put_contents("Result.htm", "$su\n", FILE_APPEND);
}
?>