Comparison of DNS Blacklists

The following table lists technical information for a number of DNS blacklists.

Blacklist operator DNS blacklist Informational URL Zone Listing goal Nomination Listing lifetime Notes Collateral Listings Notifies upon listing
ARM Research Labs, LLC GBUdb Truncate truncate.gbudb.net Extremely conservative list of single IP4 addresses that produce exclusively spam/malware as indicated by the GBUdb IP Reputation system. Most systems should be able to safely reject connections based on this list. Automatic: IPs are added when the GBUdb "cloud" statistics reach a probability figure that indicates 95% of messages produce a spam/malware pattern match and a confidence figure that indicates sufficient data to trust the probability data. Automatic: Continuous while reputation statistics remain bad. IPs are dropped quickly if the statistics improve (within an hour). IPs are dropped within 36 hours (typ) if no more messages are seen (dead zombie). Source data is derived from a global network of Message Sniffer filtering nodes in real-time. Truncate data is updated from statistics every 10 minutes. no no
invaluement DNSBL ivmSIP N/A
(paid access via rsync)		 Single IP addresses which only send UBE. Specializing in snowshoe spam and other 'under the radar' spams which evade many other DNSBLs. Has FP-level comparable to Zen. Automatic (upon receipt of a spam to a real person's mailbox), with extensive whitelists and filtering to prevent false positives Typically an automatic expiration 11 days after the last abuse was seen, but with some exceptions Spam samples are always kept on file for each listing. Removal requests are manually reviewed and processed without fees. no no
ivmSIP/24 N/A
(paid access via rsync)		 lists /24 blocks of IP addresses which usually only send UBE and containing at least several addresses which are confirmed emitters of junk mail. Collateral listings are kept to a minimum because subsections are often carved from /24 listings when spammers and legit senders share the same /24 block. Automatic once at least several IP addresses from a given block are individually listed on ivmSIP, with extensive whitelists and filtering to prevent false positives expiration time increases to many weeks as the fraction of IP addresses in the /24 block in question sending junk mail increases Removal requests are quickly and manually reviewed and processed without fees. yes no
ivmURI N/A
(paid access via rsync)		 comparable to uribl.com and surbl.org, this is a list of IP addresses and domains which are used by spammers in the clickable links found in the body of spam messages Automatic (upon receipt of a spam to a real person's mailbox), with extensive whitelists and filtering to prevent false positives Typically an automatic expiration several weeks after the last abuse was seen. Spam samples are always kept on file for each listing. Removal requests are quickly and manually reviewed and processed without fees. no no
proxyBL dnsbl dnsbl.proxybl.org Lists all types of open (publicly accessible) proxies Automated listing through crawling of websites As long as proxy is verified open (automated) Time between verifications increases exponentially in relation to the number of times the host was verified an open proxy yes no
UCEPROTECT-Network UCEPROTECT Level 1 dnsbl-1.uceprotect.net
(also free available via rsync )		 Single IP addresses that send mail to spamtraps Automatic by a cluster of more than 60 trapservers Automatic expiration 7 days after the last abuse was seen, optionally express delisting (scammers / often charge $250 dollars to hosts - Considered fraud RBL ring) UCEPROTECT's primary and the only independent list no no
UCEPROTECT Level 2 dnsbl-2.uceprotect.net
(also free available via rsync )		 Allocations with exceeded UCEPROTECT Level 1 listings Automatic calculated from UCEPROTECT-Level 1 Automatic removal as soon as Level 1 listings decrease below Level 2 listing border, optionally express delisting (expensive fee) Fully depending on Level 1 yes no
UCEPROTECT Level 3 dnsbl-3.uceprotect.net
(also free available via rsync )		 ASN's with excessive UCEPROTECT Level 1 listings Automatic calculated from UCEPROTECT-Level 1 Automatic removal as soon as Level 1 listings decrease below Level 3 listing border, optionally express delisting (fee) Fully depending on Level 1 yes no
Spam and Open Relay Blocking System (SORBS) dnsbl dnsbl.sorbs.net Unsolicited bulk/commercial email senders N/A (See individual zones) N/A (See individual zones) Aggregate zone (all aggregates and what they include are listed on SORBS) yes no
safe.dnsbl safe.dnsbl.sorbs.net Unsolicited bulk/commercial email senders N/A (See individual zones) N/A (See individual zones) "Safe" Aggregate zone (all zones in dnsbl.sorbs.net except "recent" and "escalations") yes no
http.dnsbl http.dnsbl.sorbs.net Open HTTP proxy servers Feeder servers Until delisting requested. yes no
socks.dnsbl socks.dnsbl.sorbs.net Open SOCKS proxy servers Feeder servers Until delisting requested. yes no
misc.dnsbl misc.dnsbl.sorbs.net Additional proxy servers Feeder servers Until delisting requested. Those not already listed in the HTTP or SOCKS databases yes no
smtp.dnsbl smtp.dnsbl.sorbs.net Open SMTP relay servers Feeder servers Until delisting requested. yes no
web.dnsbl web.dnsbl.sorbs.net IP addresses with vulnerabilities that are exploitable by spammers (e.g. FormMail scripts) Feeder servers Until delisting requested or Automated Expiry yes no
new.spam.dnsbl new.spam.dnsbl.sorbs.net Hosts that have sent spam to the admins of SORBS in the last 48 hours SORBS Admin and Spamtrap Renewed every 20 minutes based inclusion in on 'spam.dnsbl.sorbs.net' yes no
recent.spam.dnsbl recent.spam.dnsbl.sorbs.net Hosts that have sent spam to the admins of SORBS in the last 28 days SORBS Admin and Spamtrap Renewed every 20 minutes based inclusion in on 'spam.dnsbl.sorbs.net' yes no
old.spam.dnsbl old.spam.dnsbl.sorbs.net Hosts that have sent spam to the admins of SORBS in the last year SORBS Admin and Spamtrap Renewed every 20 minutes based inclusion in on 'spam.dnsbl.sorbs.net' yes no
spam.dnsbl spam.dnsbl.sorbs.net Hosts that have allegedly sent spam to the admins of SORBS at any time SORBS Admin and Spamtrap. Until 1 year after the last spam is received and a request has been made or until the "fine" is paid for express delisting yes no
escalations.dnsbl escalations.dnsbl.sorbs.net Netblocks of service providers believed to support spammers SORBS Admin fed. Until delisting requested and matter resolved. Service providers are added on receipt of a 'third strike' spam yes no
block.dnsbl block.dnsbl.sorbs.net Hosts demanding that they never be tested Request by host N/A yes no
zombie.dnsbl zombie.dnsbl.sorbs.net Hijacked networks SORBS Admin (manual submission) Until delisting requested. yes no
dul.dnsbl dul.dnsbl.sorbs.net Dynamic IP address ranges SORBS Admin (manual submission) Until delisting requested. Not a list of dial-up IP addresses yes no
rhsbl rhsbl.sorbs.net Aggregate RHS zones N/A N/A yes no
badconf.rhsbl badconf.rhsbl.sorbs.net Domains with invalid A or MX records in DNS Open submission via automated testing page. Until delisting requested. yes no
nomail.rhsbl nomail.rhsbl.sorbs.net Domains which the owners have confirmed will not be used for sending email Owner submission Until delisting requested. yes no
Spamhaus SBL Advisory sbl.spamhaus.org Verified sources of spam, including spammers and their support services Manual From 30 minutes to a year or more, depending on issue and resolution yes no
XBL Advisory xbl.spamhaus.org Illegal third-party exploits (e.g. open proxies and Trojan Horses) Third-party (see Notes) with automated additions Varies, under a month. Includes the Composite Blocking List and parts of the Not Just Another Bogus List yes no
PBL Advisory pbl.spamhaus.org Static, dial-up & DHCP IP address space that is not meant to be initiating SMTP connections Manual Unknown Should not be confused with the MAPS DUL and Wirehub Dynablocker lists yes no
SBL+XBL sbl-xbl.spamhaus.org A single lookup for querying the SBL and XBL databases yes no
Zen zen.spamhaus.org A single lookup for querying the SBL, XBL and PBL databases. The one to use to get all. yes no
ORBITrbl Aggressive RBL RBL rbl.orbitrbl.com Unsolicited bulk/Commercial email senders (/24 IP address block) Feeder servers Until delisting requested? (Only When Found to be Non Spam Source) Aggregate zone yes no
Composite Blocking List CBL cbl.abuseat.org
(also free available rsync access, on request see FAQ )		 Only IP addresses exhibiting characteristics specific to open proxies, spamware, botnets and the like. Automatic: large spamtraps and production mail servers Temporary, until spam stops Use Spamhaus XBL or Spamhaus Zen instead; they include CBL. yes no
Passive Spam Block List PSBL psbl.surriel.com
(also free available via rsync )		 IP addresses used to send spam to trap spamtraps Temporary, until spam stops yes no
Intercept - DNS Blacklist (DNSBL) Intercept intercept.datapacket.net IP addresses used to send spam to trap spamtraps Temporary, until spam stops yes no
Weighted Private Block List WPBL db.wpbl.info IP addresses used to send UBE to members spamtraps Temporary, until spam stops yes no
SpamCop Blocking List SCBL bl.spamcop.net IP addresses which have been used to transmit reported email to SpamCop users users submit Temporary, until spam stops yes no
SpamRats RATSNOPTR noptr.spamrats.com IP addresses detected as abusive at ISP's using MagicMail Servers, with no reverse DNS service Automatically Submitted Listed until removed, and reverse DNS configured yes no
RATSDYNA dyna.spamrats.com IP addresses detected as abusive at ISP's using MagicMail Servers, with non-conforming reverse DNS service (See Best Practises) indicative of compromised systems Automatically Submitted Listed until removed, and reverse DNS set to conform to Best Practises yes no
RATSSPAM spam.spamrats.com IP addresses detected as abusive at ISP's using MagicMail Servers, and manually confirmed as spam sources Manually Submitted Listed until removed yes no
SpamCannibal spamcannibal.org bl.spamcannibal.org IP addresses and related generic netblocks that have sent spam. spamtraps until removal requested and matter resolved by changing server DNS ptr record to a non-generic name. Even if a particular IP has not sent spam, it may be included in a generic netblock which will provide many false positives. listed=127.0.0.2 yes no
IPQuery ipquery.org any.dnsl.ipquery.org Spam sources, relay abusers, backscatterers Automated, based on traffic observed locally, with some human supervision Automatic expiry (varies by type); webpage allows delisting Keeps a listing history; retains specimens yes no
Not Just Another Bogus List NJABL DNSBL dnsbl.njabl.org open SMTP relays, multi-stage SMTP open relays, spam sources, Insecure CGI scripts that allow open relaying, and open proxy servers spamtraps, testing, testing by trusted contributors Varies yes no
Bad host, no cookie bhnc.njabl.org These hosts have done things proper SMTP servers don't do. spamtraps until de-listing requested yes no
Distributed Realtime Blocking List drand DRBL node spamtrap.drbl.drand.net IP addresses used to send spam to traps or members Automated listing. Varies from spam type, rate and other sophisticated factors. 30 s to 1 week. High IP network aggregate threshold >= 254. yes no
Junk Email Filter Hostkarma hostkarma.junkemailfilter.com
blacklist.hostkarma.com		 Detects viruses by behavior using fake high MX and tracking non-use of QUIT Automated listing Black list Data lives for 4 days. White list data lives for 10 days. 127.0.0.1=white 127.0.0.2=black 127.0.0.3=yellow yes no
The Abusive Hosts Blocking List (AHBL) dnsbl dnsbl.ahbl.org Aggregate zone, contains UCE/bulk email senders, open proxies, open relays, trojaned/infected machines, comment/trackback spammers Feeder systems, manual Until delisting requested Aggregate zone (all aggregates and what they include are listed on AHBL) yes no
rhsbl rhsbl.ahbl.org Domains sending spam, domains owned by spammers, comment spam domains, spammed URLs Manual yes no
ircbl ircbl.ahbl.org Subset of dnsbl, contains only open proxies, compromised machines, comment spammers Until delisting requested Designed for use on IRC servers yes no
tor tor.ahbl.org Current tor relay and exit nodes Automated N/A yes no
Dronebl dnsbl dnsbl.dronebl.org All-in-one abusive hosts blacklist Automated listing via distributed monitoring points Permanent until delisted via website. yes no
Quorum.to ip-dnsbl list.quorum.to. ( or per-subscriber: .list.quorum.to. ) Stop spam from hosts that send no legitimate mail (list most non-mail-sending hosts). Listings based on "instant" automated checks, recipient nomination and traps. Listings can be challenged. Subscribers vote to decide sender status. Public list follows standard dnsbl protocol. Subscription based service is more capable, but does not follow standard. yes no
Spamanalysis.org GeoBL User-defined: .geobl.spamanalysis.org Lists hosts known as being in certain geographic locations. Users set their own list of blocked countries. Hosts reported as being incorrectly located may be delisted. Allows basic monitoring, listed if A=127.0.0.2 or TXT=blocked yes no
Heise Zeitschriften Verlag GmbH & Co. KG, hosted by manitu GmbH NiX Spam (nixspam) ix.dnsbl.manitu.net Lists single IPs (no IP ranges) that send spam to spamtraps. Automated listing due to spamtrap hits. Exceptions apply to bounces, NDRs and whitelisted IPs. 12 hours after last listing or until self delisting TXT records provide information of listing incident - NiX Spam also provides hashes for fuzzy checksum plugin (iXhash) for SpamAssassin. no yes (for ISPs/ESPs on request)
inps.de inps.de-DNSBL dnsbl.inps.de Single IP addresses IP addresses can be reported as known spam sources by users, additionally automated listing if spam arrives at the mailservers of inps.de IP addresses are listed until they are removed manually via the website. A- and TXT records are available for each entry; Removal is free after 30 days for automatic additions and after 7 days for manual additions; otherwise removal fee is at least EUR 10,00. maybe no
enLiven.it mailer.mobi dnsbl.mailer.mobi Lists IP addresses that have been reported by multiple different methods. IP addresses can be reported as known spam sources by registered users, spam traps and script injection tests on contributor web sites. IP addresses are listed until they are contested and a request for removal has been approved. Service is free. IP addresses can be white-listed upon request. yes no
blocklist.de dnsbl bl.blocklist.de IP-Addresses who Attacks other Server/Honeypots over ssh, imap, smtp, ftp, web, rfi, sqli, ddos.... Automatic: over Honeypots and with over 515 Users and 630 Servers from blocklist.de via Fail2Ban or own scripts Automatic: 48 Hours after the last Attack. But earlier remove is available over the Delist-Link Services is free! Source data is from Honeypot-Systems and over 515 User with 630 Servern there reports Attacks with Fail2Ban no yes

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