RBL lookup script written in python3 with threading for speed

checkrbl.py

#!/usr/bin/env python3

import argparse
import socket
import threading

rbls = [
    'access.redhawk.org',
    'all.s5h.net',
    'all.spamblock.unit.liu.se',
    'b.barracudacentral.org',
    'bl.deadbeef.com',
    'bl.emailbasura.org',
    'bl.mailspike.net',
    'bl.spamcannibal.org',
    'bl.spamcop.net',
    'bl.tiopan.com',
    'black.junkemailfilter.com',
    'black.uribl.com',
    'blackholes.five-ten-sg.com',
    'blackholes.mail-abuse.org',
    'blackholes.wirehub.net',
    'blacklist.sci.kun.nl',
    'blacklist.woody.ch',
    'block.dnsbl.sorbs.net',
    'blocked.hilli.dk',
    'bogons.cymru.com',
    'bsb.spamlookup.net',
    'bsb.spamloup.net',
    'cbl.abuseat.org',
    'cbl.anti-spam.org.cn',
    'cblless.anti-spam.org.cn',
    'cblplus.anti-spam.org.cn',
    'cdl.anti-spam.org.cn',
    'combined.njabl.org',
    'combined.rbl.msrbl.net',
    'csi.cloudmark.com',
    'db.wpbl.info',
    'dev.null.dk',
    'dialup.blacklist.jippg.org',
    'dialups.mail-abuse.org',
    'dialups.visi.com',
    'dnsbl-1.uceprotect.net',
    'dnsbl-2.uceprotect.net',
    'dnsbl-3.uceprotect.net',
    'dnsbl.abuse.ch',
    'dnsbl.anticaptcha.net',
    'dnsbl.antispam.or.id',
    'dnsbl.dronebl.org',
    'dnsbl.inps.de',
    'dnsbl.justspam.org',
    'dnsbl.kempt.net',
    'dnsbl.njabl.org',
    'dnsbl.sorbs.net',
    'dnsbl.tornevall.org',
    'dob.sibl.support-intelligence.net',
    'drone.abuse.ch',
    'dsn.rfc-ignorant.org',
    'duinv.aupads.org',
    'dul.blackhole.cantv.net',
    'dul.dnsbl.sorbs.net',
    'dul.ru',
    'dyna.spamrats.com',
    'dynablock.sorbs.net',
    'dyndns.rbl.jp',
    'dynip.rothen.com',
    'escalations.dnsbl.sorbs.net',
    'forbidden.icm.edu.pl',
    'hil.habeas.com',
    'http.dnsbl.sorbs.net',
    'httpbl.abuse.ch',
    'images.rbl.msrbl.net',
    'intruders.docs.uu.se',
    'ips.backscatterer.org',
    'ix.dnsbl.manitu.net',
    'korea.services.net',
    'ksi.dnsbl.net.au',
    'mail-abuse.blacklist.jippg.org',
    'mail.people.it',
    'misc.dnsbl.sorbs.net',
    'msgid.bl.gweep.ca',
    'multi.surbl.org',
    'multi.uribl.com',
    'netblock.pedantic.org',
    'new.dnsbl.sorbs.net',
    'no-more-funn.moensted.dk',
    'noptr.spamrats.com',
    'old.dnsbl.sorbs.net',
    'omrs.dnsbl.net.au',
    'opm.tornevall.org',
    'orvedb.aupads.org',
    'osrs.dnsbl.net.au',
    'pbl.spamhaus.org',
    'phishing.rbl.msrbl.net',
    'probes.dnsbl.net.au',
    'proxy.bl.gweep.ca',
    'psbl.surriel.com',
    'pss.spambusters.org.ar',
    'query.senderbase.org',
    'rbl-plus.mail-abuse.org',
    'rbl.efnetrbl.org',
    'rbl.interserver.net',
    'rbl.schulte.org',
    'rbl.snark.net',
    'rbl.spamlab.com',
    'rbl.suresupport.com',
    'rdts.dnsbl.net.au',
    'recent.dnsbl.sorbs.net',
    'relays.bl.gweep.ca',
    'relays.bl.kundenserver.de',
    'relays.mail-abuse.org',
    'relays.nether.net',
    'residential.block.transip.nl',
    'ricn.dnsbl.net.au',
    'rmst.dnsbl.net.au',
    'rot.blackhole.cantv.net',
    'rsbl.aupads.org',
    'sbl.spamhaus.org',
    'short.rbl.jp',
    'smtp.dnsbl.sorbs.net',
    'socks.dnsbl.sorbs.net',
    'sorbs.dnsbl.net.au',
    'spam.dnsbl.sorbs.net',
    'spam.olsentech.net',
    'spam.rbl.msrbl.net',
    'spam.spamrats.com',
    'spamguard.leadmon.net',
    'spamlist.or.kr',
    'spamrbl.imp.ch',
    'spamsources.fabel.dk',
    'tor.dan.me.uk',
    'truncate.gbudb.net',
    'ubl.lashback.com',
    'ubl.unsubscore.com',
    'uribl.swinog.ch',
    'url.rbl.jp',
    'virbl.bit.nl',
    'virus.rbl.jp',
    'virus.rbl.msrbl.net',
    'web.dnsbl.sorbs.net',
    'wormrbl.imp.ch',
    'xbl.spamhaus.org',
    'zen.spamhaus.org',
    'zombie.dnsbl.sorbs.net'
]

def check_rbl(ip, rev, rbl, verbose):
    lookup = f'{rev}.{rbl}'

    try:
        listed = socket.gethostbyname(lookup) != lookup
    except socket.gaierror:
        listed = False

    if verbose:
        print(f'Checking {lookup}... [{ "LISTED" if listed else "OK" }]')
    else:
        print('.', end='', flush=True)

    if listed:
        return rbl
    else:
        return None

if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='Check if an IP address is listed on any of RBL blacklists.')
    parser.add_argument('ip_or_hostname', help='the IP address or hostname to check')
    parser.add_argument('-v', '--verbose', action='store_true', help='display each lookup as it is')
    args = parser.parse_args()

    try:
        # Try to convert argument to an IP address
        ip = socket.gethostbyname(args.ip_or_hostname)
    except socket.gaierror:
        # Assume argument is already an IP address
        ip = args.ip_or_hostname

    rev = '.'.join(reversed(ip.split('.')))
    rbl_count = len(rbls)
    listed_rbls = []

    threads = []
    for rbl in rbls:
        thread = threading.Thread(target=check_rbl, args=(ip, rev, rbl, args.verbose))
        threads.append(thread)
        thread.start()

    for thread in threads:
        rbl = thread.join()
        if rbl:
            listed_rbls.append(rbl)

    if not args.verbose:
        print()

    print(f'{ip} listed on {len(listed_rbls)} of {rbl_count} known blacklists')

    if listed_rbls:
        print(f'{ip} listed on {", ".join(listed_rbls)}')