Blacklists Compared

1 June 2013

[ Fighting Spam | Dialup Zones | Blacklists Compared | Current Blacklist Comparison | Sendmail Configuration ]

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 hostkarma.junkemailfilter.com (all results but 127.0.0.2, 127.0.0.3, and 127.0.0.4), exemptions.ahbl.org, query.bondedsender.org, list.dnswl.org, accredit.habeas.com, iadb.isipp.com, iadb2.isipp.com, swl.spamhaus.org, and wl.mailspike.net zones because they are not blacklists. Because they are too aggressive to be widely useful the spam.dnsbl.sorbs.net and l2.apews.org zones are also excluded from the union.

HitsDNS Zone
71812(total number of IP addresses tested, including 143 at SDSC)
67169(union of most IP zones)
58801zen.spamhaus.org (union of all results)
57824l2.apews.org
57742b.barracudacentral.org
54835bl.mailspike.net (union of all results)
53983zen.spamhaus.org (result 127.0.0.4 = Composite Blocking List)
53982cbl.abuseat.org
49099bl.tiopan.com
42296spam.dnsbl.sorbs.net
40047hostkarma.junkemailfilter.com (result 127.0.0.2 = spam source)
39059zen.spamhaus.org (result 127.0.0.11 = Spamhaus PBL, Spamhaus entry)
36342dnsbl-1.uceprotect.net
34649bl.mailspike.net (result 127.0.0.12 = bad reputation)
34531hostkarma.junkemailfilter.com (result 127.0.1.1 = MTA sends QUIT)
29799dnsbl.sorbs.net (union of all results)
29665psbl.surriel.com
28972db.wpbl.info
23870dnsbl-2.uceprotect.net
23761all.spamrats.com (union of all results)
23214bl.spameatingmonkey.net
22516dnsbl-3.uceprotect.net
20901dnsbl.inps.de
19576ubl.unsubscore.com
17732truncate.gbudb.net
15604all.spamrats.com (result 127.0.0.36 = dialup)
15315dnsbl.sorbs.net (result 127.0.0.7 = hacked/vulnerable)
13650bl.mailspike.net (result 127.0.0.10 = worst possible reputation)
12668dnsbl.sorbs.net (result 127.0.0.10 = dialup)
12447dnsbl.sorbs.net (result 127.0.0.6 = spam source)
10370ips.backscatterer.org
9513bl.score.senderscore.com
8488bl.spamcop.net
7943all.spamrats.com (result 127.0.0.37 = no reverse DNS entry)
6177bl.mailspike.net (result 127.0.0.11 = very bad reputation)
6103list.dnswl.org (not a blacklist!)
5950wl.mailspike.net (union of all results) (not a blacklist!)
5937zen.spamhaus.org (result 127.0.0.10 = Spamhaus PBL, ISP contributed)
5531bl.mailspike.net (result 127.0.0.2 = distributed spam wave participant)
4747ix.dnsbl.manitu.net
4416hostkarma.junkemailfilter.com (result 127.0.1.2 = MTA does not send QUIT)
4157wl.mailspike.net (result 127.0.0.18 = good reputation) (not a blacklist!)
3822bl.mav.com.br
3076hostkarma.junkemailfilter.com (result 127.0.0.1 = whitelisted)
2727all.s5h.net
2608hostkarma.junkemailfilter.com (result 127.0.0.3 = mix of spam and nonspam)
1679bl.spamcannibal.org
1504tr.countries.nerd.dk
1491hostkarma.junkemailfilter.com (result 127.0.0.5 = do not blacklist)
1483wl.mailspike.net (result 127.0.0.17 = possible legitimate sender) (not a blacklist!)
1284spamsources.fabel.dk
1171free.v4bl.org
1083zen.spamhaus.org (union of SBL and SBLCSS results)
749accredit.habeas.com (not a blacklist!)
708hostkarma.junkemailfilter.com (result 127.0.0.4 = spam source aspirant)
677zen.spamhaus.org (result 127.0.0.3 = Spamhaus SBLCSS)
605query.bondedsender.org (not a blacklist!)
475mail-abuse.blacklist.jippg.org
406zen.spamhaus.org (result 127.0.0.2 = Spamhaus SBL)
317korea.services.net
280all.spamrats.com (result 127.0.0.38 = spam source)
272wl.mailspike.net (result 127.0.0.19 = very good reputation) (not a blacklist!)
204l2.bbfh.ext.sorbs.net
190iadb.isipp.com (not a blacklist!)
153dnsbl.ahbl.org (union of all results)
117dnsbl.ahbl.org (result 127.0.0.4 = spam source)
98iadb2.isipp.com (not a blacklist!)
54dnsbl.sorbs.net (result 127.0.0.3 = open socks proxy)
54dnsbl.sorbs.net (result 127.0.0.4 = open proxy)
54dnsbl.sorbs.net (result 127.0.0.2 = open http proxy)
53tor.dnsbl.sectoor.de (union of all results)
51tor.dnsbl.sectoor.de (result 127.0.0.2 = /24 contains a Tor server)
38wl.mailspike.net (result 127.0.0.20 = excellent reputation) (not a blacklist!)
23dnsbl.ahbl.org (result 127.0.0.3 = open proxy)
13dnsbl.sorbs.net (result 127.0.0.9 = zombie network)
13dnsbl.ahbl.org (result 127.0.0.10 = shoot on sight spammer)
5multi.surbl.org
3dnsbl-0.uceprotect.net
2multi.uribl.com (result 127.0.0.2 = spam resource)
2tor.dnsbl.sectoor.de (result 127.0.0.1 = Tor server)
2spamguard.leadmon.net (result 127.0.0.9 = abused DNS server)
2hostkarma.junkemailfilter.com (result 127.0.2.3 = domain first seen more than 7 days ago)
2multi.uribl.com (union of all results)
2spamguard.leadmon.net (union of all results)
1wadb.isipp.com
1dnsbl.ahbl.org (result 127.0.0.20 = blog/wiki/comment spam source)
Survey results for all known public domain-name-based DNS blacklists. Lookups were done on the domain names of connecting IP addresses. The "union of most domain zones" line includes data from the hostkarma.junkemailfilter.com zone only when the results are 127.0.0.2, 127.0.0.3, or 127.0.0.4 because other results are not blacklists.

HitsDNS Zone
71812(total number of IP addresses whose names were tested, including 143 at SDSC)
42016hostkarma.junkemailfilter.com (result 127.0.2.3 = domain first seen more than 7 days ago)
31218hostkarma.junkemailfilter.com (result 127.0.1.1 = MTA sends QUIT)
21429l1.apews.org
6575hostkarma.junkemailfilter.com (result 127.0.0.5 = do not blacklist)
2729(union of most domain zones)
2420hostkarma.junkemailfilter.com (result 127.0.0.1 = whitelisted)
1053dbl.spamhaus.org (result 127.0.1.2 = spam source)
1053dbl.spamhaus.org (union of all results)
930hostkarma.junkemailfilter.com (result 127.0.0.2 = spam source)
774hostkarma.junkemailfilter.com (result 127.0.0.3 = mix of spam and nonspam)
355hostkarma.junkemailfilter.com (result 127.0.1.4 = no verify host)
200hostkarma.junkemailfilter.com (result 127.0.2.2 = domain first seen in last 7 days)
146hostkarma.junkemailfilter.com (result 127.0.1.2 = MTA does not send QUIT)
82multi.uribl.com (result 127.0.0.2 = spam resource)
82multi.uribl.com (union of all results)
74multi.surbl.org
52fresh.spameatingmonkey.net
42dob.sibl.support-intelligence.net
42rhsbl.ahbl.org
17urired.spameatingmonkey.net
15hostkarma.junkemailfilter.com (result 127.0.2.1 = domain first seen today)
Survey results for all known public domain-name-based DNS blacklists. Lookups were done on SMTP sender domains. The "union of most domain zones" line includes data from the hostkarma.junkemailfilter.com zone only when the results are 127.0.0.2, 127.0.0.3, or 127.0.0.4 because other results are not blacklists.

HitsDNS Zone
60530(total number of domains tested, including 107 at SDSC)
50721hostkarma.junkemailfilter.com (result 127.0.2.3 = domain first seen more than 7 days ago)
3461hostkarma.junkemailfilter.com (result 127.0.1.1 = MTA sends QUIT)
3240(union of most domain zones)
2349dbl.spamhaus.org (union of all results)
2346dbl.spamhaus.org (result 127.0.1.2 = spam source)
1969hostkarma.junkemailfilter.com (result 127.0.0.2 = spam source)
1423hostkarma.junkemailfilter.com (result 127.0.0.5 = do not blacklist)
1418multi.surbl.org
1415hostkarma.junkemailfilter.com (result 127.0.0.1 = whitelisted)
1360multi.uribl.com (union of all results)
1346multi.uribl.com (result 127.0.0.2 = spam resource)
1137hostkarma.junkemailfilter.com (result 127.0.2.2 = domain first seen in last 7 days)
468l1.apews.org
453fresh.spameatingmonkey.net
279dob.sibl.support-intelligence.net
238hostkarma.junkemailfilter.com (result 127.0.0.3 = mix of spam and nonspam)
60urired.spameatingmonkey.net
29rhsbl.ahbl.org
25hostkarma.junkemailfilter.com (result 127.0.1.2 = MTA does not send QUIT)
13hostkarma.junkemailfilter.com (result 127.0.2.1 = domain first seen today)
12multi.uribl.com (result 127.0.0.4 = opt-out spam resource)
10hostkarma.junkemailfilter.com (result 127.0.1.4 = no verify host)
3dbl.spamhaus.org (result 127.0.1.3 = domain redirects to spammer)
2multi.uribl.com (result 127.0.0.8 = new domain or concealed contact)
1hostkarma.junkemailfilter.com (result 127.0.1.3 = MTA somtimes sends QUIT)
1ex.dnsbl.org
This document was last updated by Jeff Makey <jeff@sdsc.edu> on 3 June 2013.