spam ip check

gistfile1.txt

<?php

$rbls = [
	'b.barracudacentral.org',
	'cbl.abuseat.org',
	'http.dnsbl.sorbs.net',
	'misc.dnsbl.sorbs.net',
	'socks.dnsbl.sorbs.net',
	'web.dnsbl.sorbs.net',
	'dnsbl-1.uceprotect.net',
	'dnsbl-3.uceprotect.net',
	'rbl.spamlab.com',
	'noptr.spamrats.com',
	'httpbl.abuse.ch',
	'multi.surbl.org',
	'dnsbl.sorbs.net',
	'dul.dnsbl.sorbs.net',
	'smtp.dnsbl.sorbs.net',
	'spam.dnsbl.sorbs.net',
	'zombie.dnsbl.sorbs.net',
	'dyna.spamrats.com',
	'spam.spamrats.com',
	'query.senderbase.org',
	'combined.rbl.msrbl.net',
];

$ip          = '';
$rev         = join('.', array_reverse(explode('.', trim($ip))));
$i           = 1;
$rbl_count   = count($rbls);
$listed_rbls = [];

foreach ($rbls as $rbl)
{
    printf('Checking %s, %d of %d... ', $rbl, $i, $rbl_count);
    $lookup = sprintf('%s.%s', $rev, $rbl);

    $listed = gethostbyname($lookup) !== $lookup;

    printf('[%s]%s', $listed ? 'LISTED' : 'OK', PHP_EOL);

    if ( $listed )
    {
        $listed_rbls[] = $rbl;
    }

    $i++;
}

printf('%s listed on %d of %d known blacklists%s', $ip, count($listed_rbls), $rbl_count, PHP_EOL);

if ( ! empty($listed_rbls) )
{
    printf('%s listed on %s%s', $ip, join(', ', $listed_rbls), PHP_EOL);
}