Is my IP address blacklisted?

Check to see if your IP addresses are listed with over 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.



3y.spam.mrs.kithrup.com
access.redhawk.org
bl.csma.biz
bl.spamcannibal.org
bl.spamcop.net
bl.starloop.com
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
blocklist.squawk.com
blocklist2.squawk.com
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
opm.blitzed.org
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
rblmap.tu-berlin.de
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.bl.reynolds.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