Blacklists Compared

16 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
7630(total number of IP addresses tested, including 445 at SDSC)
3422(union of most IP zones)
2378xbl.selwerd.cx
1477blackholes.five-ten-sg.com (union of all results)
1169bl.spamcop.net
912dnsbl.njabl.org (union of all results)
904dnsbl.njabl.org (result 127.0.0.2 = source or relay)
903relays.osirusoft.com (union of all results)
703blocktest.relays.osirusoft.com (not a blacklist!)
596blackholes.five-ten-sg.com (result 127.0.0.2 = spam source)
534ztl.dorkslayers.com
498work.drbl.croco.net
495block.blars.org
488inputs.relays.osirusoft.com
487relays.osirusoft.com (result 127.0.0.2 = relay)
476relays.ordb.org
474blackholes.intersil.net
421outputs.orbz.org
406relays.visi.com
364blackholes.five-ten-sg.com (result 127.0.0.4 = unconfirmed opt-in)
362korea.services.net
345blackholes.wirehub.net
306blackholes.five-ten-sg.com (result 127.0.0.7 = spam haven)
276relays.osirusoft.com (result 127.0.0.4 = spam source)
255t1.bl.reynolds.net.au
253orbs.dorkslayers.com
235inputs.orbz.org
203blacklist.spambag.org
189spews.relays.osirusoft.com
170blackholes.2mbit.com (union of all results)
169flowgoaway.com
148proxies.relays.monkeys.com
146blackholes.five-ten-sg.com (result 127.0.0.3 = dialup)
144dev.null.dk
132relays.osirusoft.com (result 127.0.0.9 = open socks proxy)
132socks.relays.osirusoft.com
1223y.spam.mrs.kithrup.com
102spamsources.relays.osirusoft.com (union of all results)
100blackholes.2mbit.com (result 127.0.0.2 = source or relay)
99relays.dorkslayers.com
97spamsources.relays.osirusoft.com (result 127.0.0.4 = spam source)
97spamsources.fabel.dk
96spamguard.leadmon.net (union of all results)
90ipwhois.rfc-ignorant.org
87spam.wytnij.to
70blackholes.2mbit.com (result 127.0.0.10 = spam haven)
61blackholes.five-ten-sg.com (result 127.0.0.5 = relay output)
48spamguard.leadmon.net (result 127.0.0.2 = dialup)
46spammers.v6net.org
43spamguard.leadmon.net (result 127.0.0.7 = spam source netblock)
38sbl.spamhaus.org
33formmail.relays.monkeys.com
31spamhaus.relays.osirusoft.com
30dews.qmail.org
25dynablock.wirehub.net (result 127.0.0.2 = dialup)
25relays.osirusoft.com (result 127.0.0.6 = spamsites)
25dynablock.wirehub.net (union of all results)
22opm.blitzed.org
13http.opm.blitzed.org
11socks.opm.blitzed.org
9dialups.relays.osirusoft.com
8relays.osirusoft.com (result 127.0.0.3 = dialup)
8dnsbl.njabl.org (result 127.0.0.3 = dialup)
5spamsources.relays.osirusoft.com (result 127.0.0.6 = spamhaus)
5spamguard.leadmon.net (result 127.0.0.3 = spam source)
4blackholes.five-ten-sg.com (result 127.0.0.8 = open web form)
2pm0-no-more.compu.net
1wingate.opm.blitzed.org
1spamsites.relays.osirusoft.com (result 127.0.0.6)
1spamsites.relays.osirusoft.com (union of all results)

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
7630(total number of IP addresses whose names were tested, including 445 at SDSC)
1096(union of all domain zones)
754abuse.rfc-ignorant.org
409whois.rfc-ignorant.org
6postmaster.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
5031(total number of domains tested, including 183 at SDSC)
563(union of all domain zones)
265whois.rfc-ignorant.org
237abuse.rfc-ignorant.org
110postmaster.rfc-ignorant.org
51dsn.rfc-ignorant.org
6bandwidth-pigs.monkeys.com


This document was last updated by Jeff Makey <jeff@sdsc.edu> on 21 March 2002.