Blacklists Compared

25 January 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
48701(total number of IP addresses tested, including 143 at SDSC)
43624(union of most IP zones)
37264b.barracudacentral.org
36378zen.spamhaus.org (union of all results)
36187l2.apews.org
33575zen.spamhaus.org (result 127.0.0.4 = Composite Blocking List)
33575cbl.abuseat.org
31157spam.dnsbl.sorbs.net
27309hostkarma.junkemailfilter.com (result 127.0.0.2 = spam source)
27230bl.tiopan.com
26156dnsbl-1.uceprotect.net
25836hostkarma.junkemailfilter.com (result 127.0.1.1 = MTA sends QUIT)
24288ubl.unsubscore.com
23904bl.mailspike.net (union of all results)
20996bl.mailspike.net (result 127.0.0.10 = worst possible reputation)
20989zen.spamhaus.org (result 127.0.0.11 = Spamhaus PBL, Spamhaus entry)
17187db.wpbl.info
16275dnsbl.inps.de
15854dnsbl.sorbs.net (union of all results)
15534bl.spameatingmonkey.net
13589all.spamrats.com (union of all results)
12012psbl.surriel.com
10023dnsbl-2.uceprotect.net
9569all.spamrats.com (result 127.0.0.36 = dialup)
9305dnsbl-3.uceprotect.net
8498dnsbl.sorbs.net (result 127.0.0.7 = hacked/vulnerable)
7242dnsbl.sorbs.net (result 127.0.0.10 = dialup)
6244truncate.gbudb.net
6035list.dnswl.org (not a blacklist!)
5724ips.backscatterer.org
5395wl.mailspike.net (union of all results) (not a blacklist!)
4088zen.spamhaus.org (result 127.0.0.10 = Spamhaus PBL, ISP contributed)
4024bl.spamcop.net
3800all.spamrats.com (result 127.0.0.37 = no reverse DNS entry)
3432wl.mailspike.net (result 127.0.0.18 = good reputation) (not a blacklist!)
3211hostkarma.junkemailfilter.com (result 127.0.0.1 = whitelisted)
3148hostkarma.junkemailfilter.com (result 127.0.0.5 = do not blacklist)
2683dnsbl.sorbs.net (result 127.0.0.6 = spam source)
2362hostkarma.junkemailfilter.com (result 127.0.1.2 = MTA does not send QUIT)
2129hostkarma.junkemailfilter.com (result 127.0.0.3 = mix of spam and nonspam)
2119ix.dnsbl.manitu.net
1829zen.spamhaus.org (union of SBL and SBLCSS results)
1742bl.mailspike.net (result 127.0.0.2 = distributed spam wave participant)
1582wl.mailspike.net (result 127.0.0.17 = possible legitimate sender) (not a blacklist!)
1575bl.spamcannibal.org
1331bl.mailspike.net (result 127.0.0.11 = very bad reputation)
1253zen.spamhaus.org (result 127.0.0.3 = Spamhaus SBLCSS)
1230all.s5h.net
941bl.mailspike.net (result 127.0.0.12 = bad reputation)
843tr.countries.nerd.dk
812accredit.habeas.com (not a blacklist!)
781bl.score.senderscore.com
735query.bondedsender.org (not a blacklist!)
688spamsources.fabel.dk
650korea.services.net
576zen.spamhaus.org (result 127.0.0.2 = Spamhaus SBL)
331free.v4bl.org
295wl.mailspike.net (result 127.0.0.19 = very good reputation) (not a blacklist!)
267mail-abuse.blacklist.jippg.org
260all.spamrats.com (result 127.0.0.38 = spam source)
258hostkarma.junkemailfilter.com (result 127.0.0.4 = spam source aspirant)
168iadb.isipp.com (not a blacklist!)
109dnsbl.sorbs.net (result 127.0.0.3 = open socks proxy)
109dnsbl.sorbs.net (result 127.0.0.4 = open proxy)
109dnsbl.sorbs.net (result 127.0.0.2 = open http proxy)
100bl.mav.com.br
86wl.mailspike.net (result 127.0.0.20 = excellent reputation) (not a blacklist!)
85iadb2.isipp.com (not a blacklist!)
47dnsbl.ahbl.org (union of all results)
42tor.dnsbl.sectoor.de (union of all results)
39tor.dnsbl.sectoor.de (result 127.0.0.2 = /24 contains a Tor server)
35dnsbl.ahbl.org (result 127.0.0.4 = spam source)
11dnsbl.ahbl.org (result 127.0.0.3 = open proxy)
11spamguard.leadmon.net (union of all results)
10spamguard.leadmon.net (result 127.0.0.9 = abused DNS server)
4multi.uribl.com (result 127.0.0.2 = spam resource)
4dnsbl-0.uceprotect.net
4multi.uribl.com (union of all results)
3tor.dnsbl.sectoor.de (result 127.0.0.1 = Tor server)
3multi.surbl.org
2dnsbl.sorbs.net (result 127.0.0.5 = open relay)
1wadb.isipp.com
1dnsbl.sorbs.net (result 127.0.0.9 = zombie network)
1spamguard.leadmon.net (result 127.0.0.7 = spam source netblock)
1dnsbl.ahbl.org (result 127.0.0.10 = shoot on sight spammer)
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
48701(total number of IP addresses whose names were tested, including 143 at SDSC)
30339hostkarma.junkemailfilter.com (result 127.0.2.3 = domain first seen more than 7 days ago)
24837hostkarma.junkemailfilter.com (result 127.0.1.1 = MTA sends QUIT)
14034l1.apews.org
4157hostkarma.junkemailfilter.com (result 127.0.0.5 = do not blacklist)
2417hostkarma.junkemailfilter.com (result 127.0.0.1 = whitelisted)
2126(union of most domain zones)
916hostkarma.junkemailfilter.com (result 127.0.0.3 = mix of spam and nonspam)
626dbl.spamhaus.org (result 127.0.1.2 = spam source)
626dbl.spamhaus.org (union of all results)
599hostkarma.junkemailfilter.com (result 127.0.0.2 = spam source)
300hostkarma.junkemailfilter.com (result 127.0.2.2 = domain first seen in last 7 days)
220hostkarma.junkemailfilter.com (result 127.0.1.4 = no verify host)
100hostkarma.junkemailfilter.com (result 127.0.1.2 = MTA does not send QUIT)
66fresh.spameatingmonkey.net
59dob.sibl.support-intelligence.net
34multi.surbl.org
32multi.uribl.com (result 127.0.0.2 = spam resource)
32multi.uribl.com (union of all results)
27rhsbl.ahbl.org
23hostkarma.junkemailfilter.com (result 127.0.2.1 = domain first seen today)
11urired.spameatingmonkey.net
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
32617(total number of domains tested, including 96 at SDSC)
16581hostkarma.junkemailfilter.com (result 127.0.2.3 = domain first seen more than 7 days ago)
11359hostkarma.junkemailfilter.com (result 127.0.2.2 = domain first seen in last 7 days)
7762(union of most domain zones)
5361hostkarma.junkemailfilter.com (result 127.0.0.2 = spam source)
4262hostkarma.junkemailfilter.com (result 127.0.1.1 = MTA sends QUIT)
3810dbl.spamhaus.org (result 127.0.1.2 = spam source)
3810dbl.spamhaus.org (union of all results)
1403hostkarma.junkemailfilter.com (result 127.0.0.1 = whitelisted)
1309hostkarma.junkemailfilter.com (result 127.0.0.5 = do not blacklist)
1102multi.uribl.com (union of all results)
1088multi.uribl.com (result 127.0.0.2 = spam resource)
974multi.surbl.org
784l1.apews.org
526hostkarma.junkemailfilter.com (result 127.0.2.1 = domain first seen today)
426dob.sibl.support-intelligence.net
400fresh.spameatingmonkey.net
201hostkarma.junkemailfilter.com (result 127.0.0.3 = mix of spam and nonspam)
47urired.spameatingmonkey.net
28rhsbl.ahbl.org
23hostkarma.junkemailfilter.com (result 127.0.1.2 = MTA does not send QUIT)
13multi.uribl.com (result 127.0.0.4 = opt-out spam resource)
11hostkarma.junkemailfilter.com (result 127.0.1.4 = no verify host)
3ex.dnsbl.org
1multi.uribl.com (result 127.0.0.8 = new domain or concealed contact)
This document was last updated by Jeff Makey <jeff@sdsc.edu> on 27 January 2014.