Blacklists Compared

19 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
7198(total number of IP addresses tested, including 428 at SDSC)
2690(union of most IP zones)
1891xbl.selwerd.cx
1409bl.spamcop.net
1088blackholes.five-ten-sg.com (union of all results)
881outputs.orbz.org
712inputs.orbz.org
698relays.ordb.org
476ztl.dorkslayers.com
415blackholes.wirehub.net
401blackholes.five-ten-sg.com (result 127.0.0.4 = unconfirmed opt-in)
332orbs.dorkslayers.com
312blackholes.intersil.net
275blackholes.five-ten-sg.com (result 127.0.0.2 = spam source)
245blackholes.five-ten-sg.com (result 127.0.0.7 = spam haven)
226dev.null.dk
211relays.visi.com
180block.blars.org
146flowgoaway.com
137blackholes.five-ten-sg.com (result 127.0.0.3 = dialup)
116blacklist.spambag.org
115pm0-no-more.compu.net
96blocktest.relays.osirusoft.com (not a blacklist!)
86relays.dorkslayers.com
80ipwhois.rfc-ignorant.org
79relays.osirusoft.com (union of all results)
69spammers.v6net.org
62inputs.relays.osirusoft.com
59relays.osirusoft.com (result 127.0.0.2 = relay)
38dynablock.wirehub.net (result 127.0.0.2 = dialup)
38dynablock.wirehub.net (union of all results)
23blackholes.five-ten-sg.com (result 127.0.0.5 = relay output)
20blackhole.compu.net
13spews.relays.osirusoft.com
12relays.osirusoft.com (result 127.0.0.4 = spam source)
7blackholes.five-ten-sg.com (result 127.0.0.8 = open web form)
3relays.osirusoft.com (result 127.0.0.9 = open socks proxy)
3dialups.relays.osirusoft.com
3relays.osirusoft.com (result 127.0.0.3 = dialup)
2relays.osirusoft.com (result 127.0.0.6 = spamsites)
2spamhaus.relays.osirusoft.com
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
7198(total number of IP addresses whose names were tested, including 428 at SDSC)
998(union of all domain zones)
376whois.rfc-ignorant.org
346abuse.rfc-ignorant.org
332postmaster.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
4593(total number of domains tested, including 105 at SDSC)
459(union of all domain zones)
248whois.rfc-ignorant.org
143abuse.rfc-ignorant.org
84postmaster.rfc-ignorant.org
49dsn.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 19 January 2002.