Is my IP address blacklisted?

Check to see if your IP addresses are listed with 100 DNS based anti-spam databases! Will your mail server be blocked by DNSbl filters?

Probably the most common way of detecting spam is rejecting mail that comes from mail servers known (or believed) to send spam. This is done by taking the IP address of the remote mail server, converting it to a domain name using the ip4r format (a.b.c.d becomes d.c.b.a.lookupzone.com), and doing a lookup to check if that IP address is listed in one of the databases.

Just because the IP is listed with a particular blacklist does not mean that you are sending spam, just that particular blacklist suggests not to accept mail directly from that IP address. Most residential Cable/DSL IP addresses that are dynamically assigned will indicate that they are blacklisted, meaning you should be sending from your ISP's mail server, not a mail server running on your own internet connection.

If you have questions or would like to discuss DNS based blacklists please visit the DNS based Blacklists Forum.

Update April 2008 - We are in the process of adding details for each of the block lists. As we update each block list we'll active a link on the list below. You can click on the link to learn more about that DNSbl.

Checking 38.103.63.16. Please wait a minute for the checks to complete.

access.redhawk.org	bl.csma.biz	bl.spamcannibal.org
bl.spamcop.net	bl.technovision.dk	blackholes.five-ten-sg.com
blackholes.intersil.net	blackholes.mail-abuse.org	blackholes.sandes.dk
blackholes.uceb.org	blackholes.wirehub.net	blacklist.sci.kun.nl
blacklist.spambag.org	block.dnsbl.sorbs.net	blocked.hilli.dk
cart00ney.surriel.com	cbl.abuseat.org	dev.null.dk
dialup.blacklist.jippg.org	dialups.mail-abuse.org	dialups.visi.com
dnsbl.ahbl.org	dnsbl.antispam.or.id	dnsbl.cyberlogic.net
dnsbl.jammconsulting.com	dnsbl.kempt.net	dnsbl.njabl.org
dnsbl.sorbs.net	dnsbl-1.uceprotect.net	dnsbl-2.uceprotect.net
dnsbl-3.uceprotect.net	dsbl.dnsbl.net.au	duinv.aupads.org
dul.dnsbl.sorbs.net	dul.ru	dynablock.njabl.org
fl.chickenboner.biz	forbidden.icm.edu.pl	hil.habeas.com
http.dnsbl.sorbs.net	http.opm.blitzed.org	intruders.docs.uu.se
korea.services.net	l1.spews.dnsbl.sorbs.net	l2.spews.dnsbl.sorbs.net
mail-abuse.blacklist.jippg.org	map.spam-rbl.com	misc.dnsbl.sorbs.net
msgid.bl.gweep.ca	multihop.dsbl.org	no-more-funn.moensted.dk
ohps.dnsbl.net.au	omrs.dnsbl.net.au	orid.dnsbl.net.au
orvedb.aupads.org	osps.dnsbl.net.au	osrs.dnsbl.net.au
owfs.dnsbl.net.au	owps.dnsbl.net.au	probes.dnsbl.net.au
proxy.bl.gweep.ca	psbl.surriel.com	pss.spambusters.org.ar
rbl.cluecentral.net	rbl.schulte.org	rbl.snark.net
rbl.triumf.ca	rdts.dnsbl.net.au	relays.bl.gweep.ca
relays.bl.kundenserver.de	relays.mail-abuse.org	relays.nether.net
ricn.dnsbl.net.au	rmst.dnsbl.net.au	rsbl.aupads.org
satos.rbl.cluecentral.net	sbl.csma.biz	sbl.spamhaus.org
sbl-xbl.spamhaus.org	smtp.dnsbl.sorbs.net	socks.dnsbl.sorbs.net
socks.opm.blitzed.org	sorbs.dnsbl.net.au	spam.dnsbl.sorbs.net
spam.olsentech.net	spam.wytnij.to	spamguard.leadmon.net
spamsites.dnsbl.net.au	spamsources.dnsbl.info	spamsources.fabel.dk
spews.dnsbl.net.au	t1.dnsbl.net.au	ucepn.dnsbl.net.au
unconfirmed.dsbl.org	web.dnsbl.sorbs.net	whois.rfc-ignorant.org
will-spam-for-food.eu.org	wingate.opm.blitzed.org	xbl.spamhaus.org
zombie.dnsbl.sorbs.net

Legend:
= Not Listed
= Listed
= Timeout Error
= Offline

Last Updated Thursday, May 01 2008 @ 08:04 pm PDT