Blacklists Compared

2 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
7775(total number of IP addresses tested, including 515 at SDSC)
3462(union of most IP zones)
2337xbl.selwerd.cx
1400blackholes.five-ten-sg.com (union of all results)
1284bl.spamcop.net
1058dnsbl.njabl.org (union of all results)
1049relays.osirusoft.com (union of all results)
1040dnsbl.njabl.org (result 127.0.0.2 = source or relay)
917outputs.orbz.org
694inputs.orbz.org
691ztl.dorkslayers.com
638relays.ordb.org
594relays.osirusoft.com (result 127.0.0.2 = relay)
590inputs.relays.osirusoft.com
567blackholes.five-ten-sg.com (result 127.0.0.2 = spam source)
523block.blars.org
508blocktest.relays.osirusoft.com (not a blacklist!)
481relays.visi.com
429blackholes.intersil.net
385orbs.dorkslayers.com
326blackholes.five-ten-sg.com (result 127.0.0.4 = unconfirmed opt-in)
320blackholes.wirehub.net
314relays.osirusoft.com (result 127.0.0.4 = spam source)
295blackholes.five-ten-sg.com (result 127.0.0.7 = spam haven)
279korea.services.net
219blacklist.spambag.org
216spews.relays.osirusoft.com
203dev.null.dk
197t1.bl.reynolds.net.au
157blackholes.five-ten-sg.com (result 127.0.0.3 = dialup)
155flowgoaway.com
142proxies.relays.monkeys.com
138spamsources.fabel.dk
126socks.relays.osirusoft.com
125relays.dorkslayers.com
124relays.osirusoft.com (result 127.0.0.9 = open socks proxy)
124spamsources.relays.osirusoft.com (union of all results)
118spamsources.relays.osirusoft.com (result 127.0.0.4 = spam source)
1133y.spam.mrs.kithrup.com
112blackholes.2mbit.com (union of all results)
111ipwhois.rfc-ignorant.org
103blackholes.2mbit.com (result 127.0.0.2 = source or relay)
75spam.wytnij.to
58spamguard.leadmon.net (union of all results)
55spammers.v6net.org
49sbl.spamhaus.org
48blackholes.five-ten-sg.com (result 127.0.0.5 = relay output)
45spamhaus.relays.osirusoft.com
40relays.osirusoft.com (result 127.0.0.6 = spamsites)
34dynablock.wirehub.net (result 127.0.0.2 = dialup)
34dynablock.wirehub.net (union of all results)
32spamguard.leadmon.net (result 127.0.0.2 = dialup)
22dialups.relays.osirusoft.com
21dews.qmail.org
20relays.osirusoft.com (result 127.0.0.3 = dialup)
18dnsbl.njabl.org (result 127.0.0.3 = dialup)
18formmail.relays.monkeys.com
18spamguard.leadmon.net (result 127.0.0.7 = spam source netblock)
16opm.blitzed.org
14http.opm.blitzed.org
9blackholes.2mbit.com (result 127.0.0.10 = spam haven)
8spamguard.leadmon.net (result 127.0.0.3 = spam source)
6spamsources.relays.osirusoft.com (result 127.0.0.6 = spamhaus)
4blackholes.five-ten-sg.com (result 127.0.0.9 = misc)
3spamsites.relays.osirusoft.com (result 127.0.0.6)
3blackholes.five-ten-sg.com (result 127.0.0.8 = open web form)
3spamsites.relays.osirusoft.com (union of all results)
2socks.opm.blitzed.org
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
7775(total number of IP addresses whose names were tested, including 515 at SDSC)
1207(union of all domain zones)
902abuse.rfc-ignorant.org
385whois.rfc-ignorant.org
11postmaster.rfc-ignorant.org
1dsn.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
4881(total number of domains tested, including 189 at SDSC)
555(union of all domain zones)
246whois.rfc-ignorant.org
225abuse.rfc-ignorant.org
111postmaster.rfc-ignorant.org
61dsn.rfc-ignorant.org
9bandwidth-pigs.monkeys.com
1in.dnsbl.org (result 127.0.0.2 = spam source)
1in.dnsbl.org (union of all results)


This document was last updated by Jeff Makey <jeff@sdsc.edu> on 3 March 2002.