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Here's the simple script to harvest the IP's for the domains we are interested in:

<?php 

ini_set('display_errors',0);
error_reporting(0);

define('DBHOST', 'yourDatabaseHost');
define('DBUSER', 'yourDatabaseUser');
define('DBPASS', 'yourDatabasePassword');
define('DATABASE', 'YourDatabaseName');

$db = new mysqli(DBHOST, DBUSER, DBPASS, DATABASE);

if (mysqli_connect_error()) {
	die('Connect Error (' . mysqli_connect_errno() . ') ' . mysqli_connect_error());
}

$db->query("SET NAMES 'utf8'");


//////////////////////////////////////////////////
// Gets the domains from PIA
//////////////////////////////////////////////////

$dat = file_get_contents('https://www.privateinternetaccess.com/pages/network/');

$dom = new DomDocument();
$dom->loadHTML($dat);

$tds = $dom->getElementsByTagName('td');
	
$hosts = array();

foreach ($tds as $tdkey => $td){

	$value = $td->nodeValue;	
	
	$pos = strpos($value, '.privateinternetaccess.com');
	
	if ($pos !== false){

		$parent = $td->parentNode;
		
		if ($parent->tagName == 'tr'){
			
			$childs = $parent->childNodes;
			
			$count = $childs->item(4)->nodeValue;
			$host = $childs->item(0)->nodeValue;
			if (substr($host,0, 3) == 'us-'){	
				$hosts[$host] = array($count, $host);
			}

		}
		
	}
	
}


//////////////////////////////////////////////////
// Insert the hosts into the DB
//////////////////////////////////////////////////

foreach ($hosts as $hkey => $host){
	
	$query = " insert into domain (domainName, ipCount) values (";
	$query .= " '" . $db->real_escape_string(trim($host[1])) . "' ";
	$query .= " ," . intval($host[0]) . ") ";
	
	$db->query($query);
	
}
	
$domains = array();
	
$query = " select * from domain order by domainId ";
	
if ($result = $db->query($query)) {
	if ($result->num_rows > 0){
		while ($row = $result->fetch_assoc()){
			$domains[] = $row;
		}
	}
}

$count = 0;

//////////////////////////////////////////////////
// Endlessly query the nameserver
//////////////////////////////////////////////////

while(1){

	echo "\n\n\n";
	
	foreach ($domains as $dkey => $domain){

		echo "\nProcessing for " . $domain['domainName'] . "\n";

		$outputs = array();

		exec('/usr/bin/dig +nocmd +noall +answer ' . $domain['domainName'] . ' @ns1.p28.dynect.net', $outputs);
		
		foreach ($outputs as $okey => $output){
			
			$match = array();
			
			if (preg_match('/\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/', $output, $match)) {
				$valid = filter_var($match[0], FILTER_VALIDATE_IP);
				if ($valid){
					echo $match[0];		

					$query = " insert into ip (domainId, ipAddress) values (";
					$query .= " " . intval($domain['domainId']) . " ";
					$query .= " ,'" . $db->real_escape_string($match[0]) . "') ";
						
					$db->query($query);
								
					echo "    " . $match[0] . "\n";

				}
			}			
			
		}

		echo "\n";
	
	}

	echo "\n";
	
	echo 'Iteration : ' . ++$count;
	
	echo "\n\n";
	
	sleep(1);
	
}

?>

At this point you should have a table full of IP's for each of the domains.  Now do something useful with them :)

This is only useful if you NEED to know the individual IP's.  Most usage scenarios it would be sufficient to use the domain name and get a random IP via DNS.

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