Blacklists Compared

2 February 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
7160(total number of IP addresses tested, including 324 at SDSC)
2813(union of most IP zones)
2081xbl.selwerd.cx
1456bl.spamcop.net
1161blackholes.five-ten-sg.com (union of all results)
895outputs.orbz.org
894dnsbl.njabl.org (union of all results)
863dnsbl.njabl.org (result 127.0.0.2 = source or relay)
678inputs.orbz.org
587relays.ordb.org
501ztl.dorkslayers.com
402blackholes.wirehub.net
399blackholes.five-ten-sg.com (result 127.0.0.4 = unconfirmed opt-in)
373relays.visi.com
366blackholes.intersil.net
337blackholes.five-ten-sg.com (result 127.0.0.2 = spam source)
293orbs.dorkslayers.com
248blackholes.five-ten-sg.com (result 127.0.0.7 = spam haven)
213dev.null.dk
211block.blars.org
146flowgoaway.com
139blackholes.five-ten-sg.com (result 127.0.0.3 = dialup)
129blacklist.spambag.org
104pm0-no-more.compu.net
96ipwhois.rfc-ignorant.org
83relays.dorkslayers.com
83relays.osirusoft.com (union of all results)
81blocktest.relays.osirusoft.com (not a blacklist!)
60spammers.v6net.org
53relays.osirusoft.com (result 127.0.0.2 = relay)
48inputs.relays.osirusoft.com
42dynablock.wirehub.net (result 127.0.0.2 = dialup)
42dynablock.wirehub.net (union of all results)
33blackholes.five-ten-sg.com (result 127.0.0.5 = relay output)
31dnsbl.njabl.org (result 127.0.0.3 = dialup)
29blackhole.compu.net
26relays.osirusoft.com (result 127.0.0.4 = spam source)
24spews.relays.osirusoft.com
5blackholes.five-ten-sg.com (result 127.0.0.8 = open web form)
4spamsources.relays.osirusoft.com (result 127.0.0.4 = spam source)
4spamsources.relays.osirusoft.com (union of all results)
2opm.blitzed.org
2relays.osirusoft.com (result 127.0.0.3 = dialup)
1socks.opm.blitzed.org
1http.opm.blitzed.org
1relays.osirusoft.com (result 127.0.0.6 = spamsites)
1spamhaus.relays.osirusoft.com
1relays.osirusoft.com (result 127.0.0.9 = open socks proxy)
1socks.relays.osirusoft.com
1dialups.relays.osirusoft.com

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
7160(total number of IP addresses whose names were tested, including 324 at SDSC)
983(union of all domain zones)
785abuse.rfc-ignorant.org
350postmaster.rfc-ignorant.org
258whois.rfc-ignorant.org
2dsn.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
4905(total number of domains tested, including 174 at SDSC)
539(union of all domain zones)
239whois.rfc-ignorant.org
233abuse.rfc-ignorant.org
93postmaster.rfc-ignorant.org
59dsn.rfc-ignorant.org
6bandwidth-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 February 2002.