Blacklists Compared

6 April 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, l2.apews.org, and ip.v4bl.org zones are also excluded from the union.

HitsDNS Zone
104410(total number of IP addresses tested, including 166 at SDSC)
98605(union of most IP zones)
83626b.barracudacentral.org
83312zen.spamhaus.org (union of all results)
83041ip.v4bl.org
81596zen.spamhaus.org (result 127.0.0.4 = Composite Blocking List)
81171cbl.abuseat.org
79866bl.mailspike.net (union of all results)
73174bl.tiopan.com
66795bl.mailspike.net (result 127.0.0.12 = bad reputation)
64747dnsbl-1.uceprotect.net
61769hostkarma.junkemailfilter.com (result 127.0.0.2 = spam source)
60793zen.spamhaus.org (result 127.0.0.11 = Spamhaus PBL, Spamhaus entry)
57261spam.dnsbl.sorbs.net
52481dnsbl.inps.de
51457db.wpbl.info
51359psbl.surriel.com
49794dnsbl.sorbs.net (union of all results)
43378dnsbl-2.uceprotect.net
42401dnsbl-3.uceprotect.net
39426ubl.unsubscore.com
35384bl.spameatingmonkey.net
32176all.spamrats.com (union of all results)
29817dnsbl.sorbs.net (result 127.0.0.7 = hacked/vulnerable)
29137hostkarma.junkemailfilter.com (result 127.0.1.1 = MTA sends QUIT)
20361truncate.gbudb.net
19181dnsbl.sorbs.net (result 127.0.0.10 = dialup)
18908all.spamrats.com (result 127.0.0.36 = dialup)
18174dnsbl.sorbs.net (result 127.0.0.6 = spam source)
15495bl.spamcop.net
12843all.spamrats.com (result 127.0.0.37 = no reverse DNS entry)
11592hostkarma.junkemailfilter.com (result 127.0.1.2 = MTA does not send QUIT)
10716free.v4bl.org
9795bl.score.senderscore.com
9765ips.backscatterer.org
9135bl.mailspike.net (result 127.0.0.11 = very bad reputation)
8907ix.dnsbl.manitu.net
8541bl.mailspike.net (result 127.0.0.2 = distributed spam wave participant)
8194wl.mailspike.net (union of all results) (not a blacklist!)
7456list.dnswl.org (not a blacklist!)
7375zen.spamhaus.org (result 127.0.0.10 = Spamhaus PBL, ISP contributed)
5911all.s5h.net
5372wl.mailspike.net (result 127.0.0.18 = good reputation) (not a blacklist!)
5017bl.mav.com.br
3748hostkarma.junkemailfilter.com (result 127.0.0.1 = whitelisted)
3468mail-abuse.blacklist.jippg.org
3401bl.mailspike.net (result 127.0.0.10 = worst possible reputation)
3190hostkarma.junkemailfilter.com (result 127.0.0.3 = mix of spam and nonspam)
2372bl.spamcannibal.org
2337wl.mailspike.net (result 127.0.0.17 = possible legitimate sender) (not a blacklist!)
1759hostkarma.junkemailfilter.com (result 127.0.0.5 = do not blacklist)
1187spamsources.fabel.dk
926zen.spamhaus.org (union of SBL and SBLCSS results)
786tr.countries.nerd.dk
724accredit.habeas.com (not a blacklist!)
695korea.services.net
625query.bondedsender.org (not a blacklist!)
548zen.spamhaus.org (result 127.0.0.2 = Spamhaus SBL)
546all.spamrats.com (result 127.0.0.38 = spam source)
378zen.spamhaus.org (result 127.0.0.3 = Spamhaus SBLCSS)
378wl.mailspike.net (result 127.0.0.19 = very good reputation) (not a blacklist!)
320hostkarma.junkemailfilter.com (result 127.0.0.4 = spam source aspirant)
258l2.bbfh.ext.sorbs.net
227dnsbl.ahbl.org (union of all results)
220iadb.isipp.com (not a blacklist!)
173dnsbl.ahbl.org (result 127.0.0.4 = spam source)
107wl.mailspike.net (result 127.0.0.20 = excellent reputation) (not a blacklist!)
95iadb2.isipp.com (not a blacklist!)
52tor.dnsbl.sectoor.de (union of all results)
50tor.dnsbl.sectoor.de (result 127.0.0.2 = /24 contains a Tor server)
47dnsbl.sorbs.net (result 127.0.0.3 = open socks proxy)
47dnsbl.sorbs.net (result 127.0.0.4 = open proxy)
47dnsbl.sorbs.net (result 127.0.0.2 = open http proxy)
42dnsbl.ahbl.org (result 127.0.0.3 = open proxy)
23dnsbl.sorbs.net (result 127.0.0.9 = zombie network)
12dnsbl.ahbl.org (result 127.0.0.10 = shoot on sight spammer)
8hostkarma.junkemailfilter.com (result 127.0.2.3 = domain first seen more than 7 days ago)
7spamguard.leadmon.net (union of all results)
5spamguard.leadmon.net (result 127.0.0.9 = abused DNS server)
2tor.dnsbl.sectoor.de (result 127.0.0.1 = Tor server)
2multi.surbl.org
2spamguard.leadmon.net (result 127.0.0.7 = spam source netblock)
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
104410(total number of IP addresses whose names were tested, including 166 at SDSC)
57936hostkarma.junkemailfilter.com (result 127.0.2.3 = domain first seen more than 7 days ago)
40605hostkarma.junkemailfilter.com (result 127.0.1.1 = MTA sends QUIT)
6606hostkarma.junkemailfilter.com (result 127.0.0.5 = do not blacklist)
3337hostkarma.junkemailfilter.com (result 127.0.0.1 = whitelisted)
3146(union of most domain zones)
1192hostkarma.junkemailfilter.com (result 127.0.0.3 = mix of spam and nonspam)
823hostkarma.junkemailfilter.com (result 127.0.0.2 = spam source)
647dbl.spamhaus.org (union of all results)
645dbl.spamhaus.org (result 127.0.1.2 = spam source)
638hostkarma.junkemailfilter.com (result 127.0.1.4 = no verify host)
229hostkarma.junkemailfilter.com (result 127.0.1.2 = MTA does not send QUIT)
217hostkarma.junkemailfilter.com (result 127.0.2.2 = domain first seen in last 7 days)
176urired.spameatingmonkey.net
91dob.sibl.support-intelligence.net
86fresh.spameatingmonkey.net
57multi.uribl.com (union of all results)
56multi.uribl.com (result 127.0.0.2 = spam resource)
40multi.surbl.org
22rhsbl.ahbl.org
9hostkarma.junkemailfilter.com (result 127.0.2.1 = domain first seen today)
2dbl.spamhaus.org (result 127.0.1.3 = domain redirects to spammer)
1multi.uribl.com (result 127.0.0.8 = new domain or concealed contact)
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
76059(total number of domains tested, including 136 at SDSC)
64301hostkarma.junkemailfilter.com (result 127.0.2.3 = domain first seen more than 7 days ago)
17334(union of most domain zones)
16311hostkarma.junkemailfilter.com (result 127.0.0.2 = spam source)
5223hostkarma.junkemailfilter.com (result 127.0.1.1 = MTA sends QUIT)
3239hostkarma.junkemailfilter.com (result 127.0.0.5 = do not blacklist)
2720hostkarma.junkemailfilter.com (result 127.0.0.1 = whitelisted)
2128dbl.spamhaus.org (union of all results)
2125dbl.spamhaus.org (result 127.0.1.2 = spam source)
1724multi.surbl.org
1366multi.uribl.com (union of all results)
1347multi.uribl.com (result 127.0.0.2 = spam resource)
1268hostkarma.junkemailfilter.com (result 127.0.2.2 = domain first seen in last 7 days)
439hostkarma.junkemailfilter.com (result 127.0.0.3 = mix of spam and nonspam)
420dob.sibl.support-intelligence.net
300fresh.spameatingmonkey.net
68urired.spameatingmonkey.net
57hostkarma.junkemailfilter.com (result 127.0.1.2 = MTA does not send QUIT)
23hostkarma.junkemailfilter.com (result 127.0.1.4 = no verify host)
18rhsbl.ahbl.org
16multi.uribl.com (result 127.0.0.4 = opt-out spam resource)
8ex.dnsbl.org
3multi.uribl.com (result 127.0.0.8 = new domain or concealed contact)
3hostkarma.junkemailfilter.com (result 127.0.2.1 = domain first seen today)
3dbl.spamhaus.org (result 127.0.1.3 = domain redirects to spammer)
1hostkarma.junkemailfilter.com (result 127.0.1.3 = MTA somtimes sends QUIT)
This document was last updated by Jeff Makey <jeff@sdsc.edu> on 9 April 2013.