Blacklists Compared

26 January 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
6611(total number of IP addresses tested, including 298 at SDSC)
2481(union of most IP zones)
1853xbl.selwerd.cx
1209bl.spamcop.net
1076blackholes.five-ten-sg.com (union of all results)
692outputs.orbz.org
680dnsbl.njabl.org (union of all results)
659dnsbl.njabl.org (result 127.0.0.2 = source or relay)
498inputs.orbz.org
435ztl.dorkslayers.com
412blackholes.wirehub.net
410blackholes.five-ten-sg.com (result 127.0.0.4 = unconfirmed opt-in)
382relays.ordb.org
308blackholes.intersil.net
291blackholes.five-ten-sg.com (result 127.0.0.2 = spam source)
258orbs.dorkslayers.com
228relays.visi.com
222blackholes.five-ten-sg.com (result 127.0.0.7 = spam haven)
180block.blars.org
153dev.null.dk
150flowgoaway.com
126blackholes.five-ten-sg.com (result 127.0.0.3 = dialup)
123blacklist.spambag.org
122pm0-no-more.compu.net
94ipwhois.rfc-ignorant.org
62relays.dorkslayers.com
59relays.osirusoft.com (union of all results)
53spammers.v6net.org
53blocktest.relays.osirusoft.com (not a blacklist!)
33relays.osirusoft.com (result 127.0.0.4 = spam source)
27dynablock.wirehub.net (result 127.0.0.2 = dialup)
27blackhole.compu.net
27dynablock.wirehub.net (union of all results)
24relays.osirusoft.com (result 127.0.0.2 = relay)
24inputs.relays.osirusoft.com
22blackholes.five-ten-sg.com (result 127.0.0.5 = relay output)
21spews.relays.osirusoft.com
21dnsbl.njabl.org (result 127.0.0.3 = dialup)
14spamsources.relays.osirusoft.com (result 127.0.0.4 = spam source)
14spamsources.relays.osirusoft.com (union of all results)
5blackholes.five-ten-sg.com (result 127.0.0.8 = open web form)
2relays.osirusoft.com (result 127.0.0.9 = open socks proxy)
2socks.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
6611(total number of IP addresses whose names were tested, including 298 at SDSC)
997(union of all domain zones)
708abuse.rfc-ignorant.org
350whois.rfc-ignorant.org
310postmaster.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
4559(total number of domains tested, including 82 at SDSC)
495(union of all domain zones)
217whois.rfc-ignorant.org
200abuse.rfc-ignorant.org
98postmaster.rfc-ignorant.org
56dsn.rfc-ignorant.org
7bandwidth-pigs.monkeys.com
2in.dnsbl.org (result 127.0.0.2 = spam source)
2in.dnsbl.org (union of all results)


This document was last updated by Jeff Makey <jeff@sdsc.edu> on 26 January 2002.