librenms-librenms/contrib/generate-iplist.php

#!/usr/bin/env php
<?php

/*
 * Observium
 *
 *   This file is part of Observium.
 *
 * @package    observium
 * @subpackage discovery
 * @author     Adam Armstrong <adama@memetic.org>
 * @copyright  (C) 2006 - 2012 Adam Armstrong
 */

require 'includes/defaults.inc.php';
require 'config.php';
require 'includes/definitions.inc.php';
require 'includes/functions.php';

$handle = fopen('ips.txt', 'w');

foreach (dbFetchRows('SELECT * FROM `ipv4_networks`') as $data) {
    $cidr                  = $data['ipv4_network'];
    list ($network, $bits) = explode('/', $cidr);
    if ($bits != '32' && $bits != '32' && $bits > '22') {
        $addr      = Net_IPv4::parseAddress($cidr);
        $broadcast = $addr->broadcast;
        $ip        = ip2long($network) + '1';
        $end       = ip2long($broadcast);
        while ($ip < $end) {
            $ipdotted = long2ip($ip);
            if (dbFetchCell('SELECT COUNT(ipv4_address_id) FROM `ipv4_addresses` WHERE `ipv4_address` = ?', array($ipdotted)) == '0' && match_network($config['nets'], $ipdotted)) {
                fputs($handle, $ipdotted."\n");
            }

            $ip++;
        }
    }
}

fclose($handle);

shell_exec('fping -t 100 -f ips.txt > ips-scanned.txt');