Blacklists Compared

9 March 2002

[ Fighting Spam | Blacklists Compared | Current Blacklist Comparison ]


Survey results for all known public IP-based DNS blacklists. Lookups were done on connecting IP addresses. The "union of most IP zones" line excludes the xbl.selwerd.cx zone because it is too aggressive to be widely useful, and excludes the blocktest.relays.osirusoft.com zone because it is not a blacklist.

HitsDNS Zone
7287(total number of IP addresses tested, including 337 at SDSC)
3383(union of most IP zones)
2304xbl.selwerd.cx
1470blackholes.five-ten-sg.com (union of all results)
1171bl.spamcop.net
863dnsbl.njabl.org (union of all results)
860relays.osirusoft.com (union of all results)
856dnsbl.njabl.org (result 127.0.0.2 = source or relay)
749work.drbl.croco.net
668outputs.orbz.org
606ztl.dorkslayers.com
570blackholes.five-ten-sg.com (result 127.0.0.2 = spam source)
496block.blars.org
489inputs.orbz.org
474blackholes.intersil.net
430blocktest.relays.osirusoft.com (not a blacklist!)
424relays.ordb.org
418inputs.relays.osirusoft.com
415relays.osirusoft.com (result 127.0.0.2 = relay)
360blackholes.five-ten-sg.com (result 127.0.0.7 = spam haven)
345blackholes.wirehub.net
335relays.visi.com
334blackholes.five-ten-sg.com (result 127.0.0.4 = unconfirmed opt-in)
323korea.services.net
300relays.osirusoft.com (result 127.0.0.4 = spam source)
216orbs.dorkslayers.com
208blacklist.spambag.org
193t1.bl.reynolds.net.au
182spews.relays.osirusoft.com
173blackholes.2mbit.com (union of all results)
163flowgoaway.com
155blackholes.five-ten-sg.com (result 127.0.0.3 = dialup)
150proxies.relays.monkeys.com
136dev.null.dk
134relays.osirusoft.com (result 127.0.0.9 = open socks proxy)
134socks.relays.osirusoft.com
126spamsources.relays.osirusoft.com (union of all results)
123spamsources.relays.osirusoft.com (result 127.0.0.4 = spam source)
110spamsources.fabel.dk
109blackholes.2mbit.com (result 127.0.0.2 = source or relay)
1073y.spam.mrs.kithrup.com
92spamguard.leadmon.net (union of all results)
88spam.wytnij.to
79ipwhois.rfc-ignorant.org
78relays.dorkslayers.com
64blackholes.2mbit.com (result 127.0.0.10 = spam haven)
57spammers.v6net.org
51spamguard.leadmon.net (result 127.0.0.2 = dialup)
48blackholes.five-ten-sg.com (result 127.0.0.5 = relay output)
46sbl.spamhaus.org
36spamhaus.relays.osirusoft.com
34spamguard.leadmon.net (result 127.0.0.7 = spam source netblock)
28relays.osirusoft.com (result 127.0.0.6 = spamsites)
24formmail.relays.monkeys.com
22opm.blitzed.org
17dews.qmail.org
16http.opm.blitzed.org
16dialups.relays.osirusoft.com
14dynablock.wirehub.net (result 127.0.0.2 = dialup)
14relays.osirusoft.com (result 127.0.0.3 = dialup)
14dynablock.wirehub.net (union of all results)
8socks.opm.blitzed.org
7dnsbl.njabl.org (result 127.0.0.3 = dialup)
7spamguard.leadmon.net (result 127.0.0.3 = spam source)
3spamsources.relays.osirusoft.com (result 127.0.0.6 = spamhaus)
2blackholes.five-ten-sg.com (result 127.0.0.8 = open web form)
1blackholes.five-ten-sg.com (result 127.0.0.9 = misc)
1pm0-no-more.compu.net

The blackholes.intersil.net zone "lists entrenched spammers, mainsleaze and mainsleaze wannabes who have pestered users at Intersil." The flowgoaway.com zone lists FloNetwork systems. The blackhole.compu.net zone "is primarily for hosts which were not blocked by other blackhole sites and spammed compu.net" and the pm0-no-more.compu.net zone "blocks all pm0 email."


Survey results for all known public domain-name-based DNS blacklists. Lookups were done on the domain names of connecting IP addresses.

HitsDNS Zone
7287(total number of IP addresses whose names were tested, including 337 at SDSC)
1095(union of all domain zones)
788abuse.rfc-ignorant.org
377whois.rfc-ignorant.org
18postmaster.rfc-ignorant.org
12dsn.rfc-ignorant.org (zone not intended for this use)


Survey results for all known public domain-name-based DNS blacklists. Lookups were done on SMTP sender domains.

HitsDNS Zone
4718(total number of domains tested, including 74 at SDSC)
543(union of all domain zones)
248whois.rfc-ignorant.org
236abuse.rfc-ignorant.org
107postmaster.rfc-ignorant.org
52dsn.rfc-ignorant.org
7bandwidth-pigs.monkeys.com


This document was last updated by Jeff Makey <jeff@sdsc.edu> on 10 March 2002.