Blacklists Compared

5 April 2014

[ 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
52214(total number of IP addresses tested, including 150 at SDSC)
47087(union of most IP zones)
40173b.barracudacentral.org
38617zen.spamhaus.org (union of all results)
36461zen.spamhaus.org (result 127.0.0.4 = Composite Blocking List)
36303cbl.abuseat.org
33906spam.dnsbl.sorbs.net
33275l2.apews.org
31162bl.tiopan.com
31022ubl.unsubscore.com
26316dnsbl-1.uceprotect.net
24287hostkarma.junkemailfilter.com (result 127.0.0.2 = spam source)
24134bl.mailspike.net (union of all results)
23204psbl.surriel.com
21343zen.spamhaus.org (result 127.0.0.11 = Spamhaus PBL, Spamhaus entry)
20880hostkarma.junkemailfilter.com (result 127.0.1.1 = MTA sends QUIT)
20186dnsbl.sorbs.net (union of all results)
19067dnsbl.inps.de
18217bl.mailspike.net (result 127.0.0.10 = worst possible reputation)
18005bl.spameatingmonkey.net
15682db.wpbl.info
13382all.spamrats.com (union of all results)
11981bl.spamcop.net
10601dnsbl-2.uceprotect.net
10536dnsbl.sorbs.net (result 127.0.0.6 = spam source)
9399all.spamrats.com (result 127.0.0.36 = dialup)
9058dnsbl-3.uceprotect.net
8795dnsbl.sorbs.net (result 127.0.0.10 = dialup)
7595truncate.gbudb.net
7409ix.dnsbl.manitu.net
6641dnsbl.sorbs.net (result 127.0.0.7 = hacked/vulnerable)
6233list.dnswl.org (not a blacklist!)
5434wl.mailspike.net (union of all results) (not a blacklist!)
5151zen.spamhaus.org (result 127.0.0.10 = Spamhaus PBL, ISP contributed)
4146bl.score.senderscore.com
3991ips.backscatterer.org
3741all.spamrats.com (result 127.0.0.37 = no reverse DNS entry)
3395hostkarma.junkemailfilter.com (result 127.0.0.1 = whitelisted)
3066hostkarma.junkemailfilter.com (result 127.0.0.5 = do not blacklist)
3049wl.mailspike.net (result 127.0.0.18 = good reputation) (not a blacklist!)
2854bl.mailspike.net (result 127.0.0.11 = very bad reputation)
2623hostkarma.junkemailfilter.com (result 127.0.0.3 = mix of spam and nonspam)
2443bl.mailspike.net (result 127.0.0.2 = distributed spam wave participant)
2191bl.mailspike.net (result 127.0.0.12 = bad reputation)
2037hostkarma.junkemailfilter.com (result 127.0.1.2 = MTA does not send QUIT)
1655all.s5h.net
1562zen.spamhaus.org (union of SBL and SBLCSS results)
1530wl.mailspike.net (result 127.0.0.17 = possible legitimate sender) (not a blacklist!)
1111korea.services.net
995spamsources.fabel.dk
950bl.spamcannibal.org
860tr.countries.nerd.dk
827zen.spamhaus.org (result 127.0.0.2 = Spamhaus SBL)
802wl.mailspike.net (result 127.0.0.19 = very good reputation) (not a blacklist!)
741accredit.habeas.com (not a blacklist!)
735zen.spamhaus.org (result 127.0.0.3 = Spamhaus SBLCSS)
659query.bondedsender.org (not a blacklist!)
312hostkarma.junkemailfilter.com (result 127.0.0.4 = spam source aspirant)
305all.spamrats.com (result 127.0.0.38 = spam source)
232free.v4bl.org
204mail-abuse.blacklist.jippg.org
156iadb.isipp.com (not a blacklist!)
90bl.mav.com.br
79dnsbl.sorbs.net (result 127.0.0.3 = open socks proxy)
79dnsbl.sorbs.net (result 127.0.0.4 = open proxy)
79dnsbl.sorbs.net (result 127.0.0.2 = open http proxy)
76iadb2.isipp.com (not a blacklist!)
53wl.mailspike.net (result 127.0.0.20 = excellent reputation) (not a blacklist!)
44tor.dnsbl.sectoor.de (union of all results)
43tor.dnsbl.sectoor.de (result 127.0.0.2 = /24 contains a Tor server)
10multi.uribl.com (result 127.0.0.2 = spam resource)
10multi.uribl.com (union of all results)
6multi.surbl.org
4dnsbl.sorbs.net (result 127.0.0.9 = zombie network)
2spamguard.leadmon.net (union of all results)
1dnsbl-0.uceprotect.net
1tor.dnsbl.sectoor.de (result 127.0.0.1 = Tor server)
1spamguard.leadmon.net (result 127.0.0.7 = spam source netblock)
1spamguard.leadmon.net (result 127.0.0.9 = abused DNS server)
1l2.bbfh.ext.sorbs.net
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
52214(total number of IP addresses whose names were tested, including 150 at SDSC)
33108hostkarma.junkemailfilter.com (result 127.0.2.3 = domain first seen more than 7 days ago)
27265hostkarma.junkemailfilter.com (result 127.0.1.1 = MTA sends QUIT)
13992l1.apews.org
3802hostkarma.junkemailfilter.com (result 127.0.0.5 = do not blacklist)
2600hostkarma.junkemailfilter.com (result 127.0.0.1 = whitelisted)
1888(union of most domain zones)
785dbl.spamhaus.org (result 127.0.1.2 = spam source)
785dbl.spamhaus.org (union of all results)
748hostkarma.junkemailfilter.com (result 127.0.0.2 = spam source)
438hostkarma.junkemailfilter.com (result 127.0.2.2 = domain first seen in last 7 days)
405hostkarma.junkemailfilter.com (result 127.0.0.3 = mix of spam and nonspam)
235hostkarma.junkemailfilter.com (result 127.0.1.4 = no verify host)
116hostkarma.junkemailfilter.com (result 127.0.1.2 = MTA does not send QUIT)
48urired.spameatingmonkey.net
47multi.uribl.com (union of all results)
46multi.uribl.com (result 127.0.0.2 = spam resource)
37multi.surbl.org
25hostkarma.junkemailfilter.com (result 127.0.2.1 = domain first seen today)
12dob.sibl.support-intelligence.net
7fresh.spameatingmonkey.net
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
36038(total number of domains tested, including 96 at SDSC)
30841hostkarma.junkemailfilter.com (result 127.0.2.3 = domain first seen more than 7 days ago)
4485hostkarma.junkemailfilter.com (result 127.0.1.1 = MTA sends QUIT)
4009(union of most domain zones)
2780hostkarma.junkemailfilter.com (result 127.0.0.2 = spam source)
2716dbl.spamhaus.org (union of all results)
2715dbl.spamhaus.org (result 127.0.1.2 = spam source)
1957hostkarma.junkemailfilter.com (result 127.0.2.2 = domain first seen in last 7 days)
1621multi.surbl.org
1531hostkarma.junkemailfilter.com (result 127.0.0.1 = whitelisted)
1456hostkarma.junkemailfilter.com (result 127.0.0.5 = do not blacklist)
1438multi.uribl.com (union of all results)
1426multi.uribl.com (result 127.0.0.2 = spam resource)
770l1.apews.org
310hostkarma.junkemailfilter.com (result 127.0.0.3 = mix of spam and nonspam)
289dob.sibl.support-intelligence.net
236fresh.spameatingmonkey.net
77urired.spameatingmonkey.net
34hostkarma.junkemailfilter.com (result 127.0.2.1 = domain first seen today)
27hostkarma.junkemailfilter.com (result 127.0.1.2 = MTA does not send QUIT)
19hostkarma.junkemailfilter.com (result 127.0.1.4 = no verify host)
11multi.uribl.com (result 127.0.0.4 = opt-out spam resource)
8ex.dnsbl.org
1multi.uribl.com (result 127.0.0.8 = new domain or concealed contact)
1hostkarma.junkemailfilter.com (result 127.0.1.3 = MTA somtimes sends QUIT)
1dbl.spamhaus.org (result 127.0.1.3 = domain redirects to spammer)
This document was last updated by Jeff Makey <jeff@sdsc.edu> on 9 April 2014.