Multi DNSBL-check: look up an IP address in DNS blackhole lists

Check an IP v4 internet address against a selected number of common public DNS-based blackhole lists to see if it is blacklisted as a public spam source (also called Multi-DNSBL or Multi-RBL check). These block lists are maintained and operated by various organizations to fight mail abuse by UBE/UCE spam.

Please note: This is just an interactive online tool to look at these DNSBL lists. These lists are not hosted on this server, WE are not 'blocking' your mail traffic to the internet, we do NOT maintain any of these lists and can NOT remove anything. Of course, NONE of these DNSBLs is blocking your mail traffic to the internet, either. However, your recipient's mail server admin may have chosen to refuse to accept mails from spam sources by referencing one of these lists, though.
Each DNSBL is individually maintained. For any removal follow the link in the output to the homepage of the respective DNSBL maintainer and read the published instructions carefully.
This online service is for private non-commercial use only. Please do not abuse. No bots.
If you want to lookup your own client IP address: it is shown at the bottom of this page, just copy/paste.

The following remote lists are checked by this online lookup service:

spam.abuse.ch, abuse.ch, dnsbl.abuse.ch
rbl.abuse.ro, rbl.abuse.ro, abuse.ro
cbl.abuseat.org, CBL (Composite Block List), cbl.abuseat.org
virbl.dnsbl.bit.nl, VIRBL (Virus BL), virbl.bit.nl
bl.blocklist.de, BL, www.blocklist.de
dnsbl.dronebl.org, dronebl.org, www.dronebl.org
dnsbl.inps.de, Inps.de DNS Black Hole List, dnsbl.inps.de
rbl.interserver.net, interserver.net, rbldata.interserver.net
mail-abuse.blacklist.jippg.org, BL, blacklist.jippg.org
hostkarma.junkemailfilter.com, BL, wiki.junkemailfilter.com
ix.dnsbl.manitu.net, iX NiX Spam DNSBL, www.dnsbl.manitu.net/
all.s5h.net, all.s5h.net, www.usenix.org.uk
dnsbl.sorbs.net, SORBS (Spam and Open Relay Blocking System) aggregate zone, www.sorbs.net
spam.dnsbl.sorbs.net, SORBS (Spam and Open Relay Blocking System), www.sorbs.net
bl.spamcop.net, SCBL (SpamCop Blocking List), www.spamcop.net
bl.spameatingmonkey.net, SEM-BLACK, spameatingmonkey.com
netbl.spameatingmonkey.net, SEM-NETBLACK, spameatingmonkey.com
bsb.spamlookup.net, spamlookup.net, spamlookup.net
multi.surbl.org, SURB, www.surbl.org
dnsbl-1.uceprotect.net, UCEPROTECT BL, www.uceprotect.net
dnsbl-2.uceprotect.net, UCEPROTECT BL, www.uceprotect.net
dnsbl-3.uceprotect.net, UCEPROTECT BL, www.uceprotect.net
db.wpbl.info, Weighted Private BL, www.wpbl.info
list.dnswl.org, a Whitelist to protect against false positives, www.dnswl.org

Here is a short description about how a DNSBL works.

Please, let me know if you like this service, if anything is not working as expected, or if you want more lists to be added.

Inclusion of a DNSBL to be checked here does not imply any endorsement or recommendation to use that list in your own productive spam fighting environment.

Checking of the following lists has been suspended, unfortunately :
-- sbl.spamhaus.org - www.spamhaus.org/sbl/ - SBL (Spamhaus Block List), they blocked this service
-- xbl.spamhaus.org - www.spamhaus.org/xbl/ - XBL (Exploits Blocklist), they blocked this service
-- pbl.spamhaus.org - www.spamhaus.org/pbl/ - PBL (Spamhaus Policy Block List), they blocked this service
-- zen.spamhaus.org - www.spamhaus.org/zen/ - ZEN (Spamhaus combined list), they blocked this service
-- --- Attention: these spamhaus lists may block you without any notice and adding a 10sec penalty
-- bl.0spam.org - 0spam.org - 0spam Spam Trap Primary Database - found dead
-- nbl.0spam.org - 0spam.org - 0spam Network Black List - found dead
-- url.0spam.org - 0spam.org - 0spam URL Black List - found dead
-- spam.spamrats.com - spamrats.com - SpamRats-Spam - found dead
-- noptr.spamrats.com - spamrats.com - SpamRats-NoPtr - found dead
-- dyna.spamrats.com - spamrats.com - SpamRats-Dyna - found dead
-- all.spamrats.com - spamrats.com - SpamRats-ALL - found dead
-- bl.spamcannibal.org - www.spamcannibal.org - SpamCannibal - shut down 2017-08
-- dnsbl.ahbl.org - www.ahbl.org - AHBL (Abusive Hosts Blocking List) - shut down 2014-03-29
-- ircbl.ahbl.org - www.ahbl.org - AHBL (Abusive Hosts Blocking List) - shut down 2014-03-29
-- combined.njabl.org - njabl.org - NJABL (Not Just Another Bogus List) - shut down 2013-03-01
-- dnsbl.njabl.org - njabl.org - NJABL (Not Just Another Bogus List) - shut down 2013-03-01
-- no-more-funn.moensted.dk - moensted.dk/spam/no-more-funn/ - Dr. Joergen Mash's DNSbl
-- blackholes.five-ten-sg.com - www.five-ten-sg.com - blackholes.five-ten-sg.com - retired.
-- dnsbl.tqmcube.com www.tqmcube.com - dynamic ranges and spam sent to traps - apparently out of service, 2009-01-20.
-- list.dsbl.org - dsbl.org - DSBL (Distributed Sender Blackhole List) - servers temporarily out of service, timeouts, 2008-06-03.
-- dnsbl.kempt.net - www.kempt.net/dnsbl/ - Kempt.net DNS Black Hole List - timeouts and unreachable, 2008-05-25.
-- blackholes.uceb.org - www.uceb.org - SPAM blocking blackhole list - not public anymore, 2008-01-05.
-- l2.apews.dnsbl.uceprotect.net - www.apews.org - Apews (Anonymous Postmasters Early Warning System), Level 2 - folded and no longer with uceprotect, 2007-08.
-- blacklist.spambag.org - spambag.org - spambag.org BL - found dead, domain not resolving since 2007-05-27
-- t1.dnsbl.net.au - dnsbl.net.au - Australian DNSBL - they are firewalling this innocent script (2007-02-17), yikes!, leading to meaningless negatives.
-- relays.ordb.org - www.ordb.org - ORDB (Open Relay Database) - closed on 2006-12-18.
-- block.blars.org - www.blars.org/errors/block.html - BLARS block list - on 2006-12-13 for no longer existing (website parked at GoDaddy).
-- all.rbl.kropka.net - rbl.kropka.net/index.php?lang=en - KropkaRBL - on 2006-10-05 for answering too slow: 18 sec, has shut down now.
-- l1.spews.dnsbl.sorbs.net - www.spews.org - Spews (Spam Prevention Early Warning System), Level 1 - dead 2006-08.
-- l2.spews.dnsbl.sorbs.net - www.spews.org - Spews (Spam Prevention Early Warning System), Level 2 - dead 2006-08.
-- opm.blitzed.org - opm.blitzed.org - Open Proxy Monitor list - dead 2006-05.
-- dnsbl.rangers.eu.org - dnsbl.rangers.eu.org - RangersBL - dead.

Recommended books about Networking.

You are coming from IP address 104.23.243.21 using port 9639.
A DNS reverse lookup on this IP address does not work.

You are talking to server www.kloth.net (91.99.97.107) on port 443 using the protocol HTTP/1.1.
Current date and time (UTC) on the server is 2026-07-04 (Sat) 06:05:06. It is the 185th day of this year.

Document URL : http://www.kloth.net/services/dnsbl.php
Copyright © 2005-2026 Ralf D. Kloth, Ludwigsburg, DE (QRQ.software). < hostmaster at kloth.net > [don't send spam]
Created 2005-07-07. Last modified 2025-08-24. Your visit 2026-07-04 06:05.06. Page created in 0.0291 sec.

[Go to the top of this page] [... to the index page] [Sending spam to this address is prohibited.]

IP-Address:		... IP-address to check (in dotted quad notation, e.g. 10.22.33.44).
		It may take up to one minute for the program to check all lists in realtime and complete ... please be patient and do not reload.