Comparison of DNS blacklists
The following table lists technical information for a number of DNS blacklists.
|Blacklist operator||DNS blacklist||Zone||Listing goal||Nomination||Listing lifetime||Notes||Collateral listings||Notifies upon listing|
|WebIron LLC RBL||BABL||babl.rbl.webiron.net||Lists IP ranges belonging to officially published abuse addresses that either bounce or request not to receive abuse notices. The aim of this list is to block companies that openly shrug their abuse responsibilities.||Abuse addresses that fail to be deliverable for 3 out of the last 7 days are automatically added.||Lifetime listing or automatic once mail delivery resumes in the case of automated additions.||Yes||No|
|CABL||cabl.rbl.webiron.net||Lists IP ranges belonging to abuse addresses that have failed to handle abuse issues for at least 30 days. The aim of this list is to hold companies accountable for the abuse that originates from their networks rather than just ignoring it.||Issues are tracked per IP for the same issue||Automatic removal is done once all hosts with abuse unresolved for 30 days have been clean for 2 weeks.||Data for lists are generated from live data collected by the WebIron web security platform.||Yes||No|
|STABL||stabl.rbl.webiron.net||Lists single IP addresses recently attacking websites and servers.||Lists IP addressed belonging to hosts that have attacked at least twice within the last 48 hours.||Automatic removal is done once a host has gone 24 hours without an incident||Data for lists are generated from live data collected by the WebIron web security platform.||No||No|
|All||all.rbl.webiron.net||Contains IP addresses and ranges from BABL, CABL, and STABL||Depends on list||Depends on list||Yes||No|
|Crawler||crawler.rbl.webiron.net||Web Crawler IP lookup used to match user agents with known crawler IP addresses. Data from this list is considered BETA.||This DNSRBL contains valid and legitimate crawlers. Matching alone should not be used for blocking||No||No|
|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. Warning: Produces false positives, and has no remedy/removal process. 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||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||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||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|
|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 for a small fee.||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 (for a 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, per policy||Manual||From five minutes to a year or more, depending on issue and resolution||Rarely (escalation)||Yes (partial)|
|XBL Advisory||xbl.spamhaus.org||Illegal third-party exploits (e.g. open proxies, email spambots, malware download sites
|Third-party with automated additions||Varies, under a month, self removal via Composite Blocking List lookup.||Consists of the Composite Blocking List||No||No|
|PBL Advisory||pbl.spamhaus.org||Addresses not meant to be initiating SMTP connections, such as residential dynamic IPs||Manual, by providers controlling the IPs or by Spamhaus PBL Team||Self-removal (see spamhaus web site)||Should not be confused with the MAPS DUL and Wirehub Dynablocker lists||No||No|
|SBL+XBL||sbl-xbl.spamhaus.org||A single lookup for querying the SBL and XBL databases||As per component list||As per component list|
|Zen||zen.spamhaus.org||A single lookup for querying the SBL, XBL and PBL databases.||Preferred list to check all Spamhaus listings with one query.||As per component list||As per component list|
|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, malware downloaders, botnets and the like.||Automatic: large spamtraps, production mail servers and other detecton methods.||Less than a month after last listable event, self-removal via CBL lookup.||Use Spamhaus XBL or Spamhaus Zen instead; they include CBL.||No||No|
|IBM DNS Blacklist||Cobion||dnsbl.cobion.com
||This DNSBL zone is part of the default configuration for Proventia Mail Security System and Lotus Protector for Mail Security||No||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||No||No|
|DNSRBL - DNS Real-time Blackhole List||DNSRBL||dnsrbl.org||IP addresses used to send spam to trap||spamtraps||Temporary, until spam stops||No||No|
|Weighted Private Block List||WPBL||db.wpbl.info||IP addresses used to send UBE to members||spamtraps||Temporary, until spam stops||No||No|
|Protected Sky RBL||RBL||bad.psky.me||IP Reputation based. Seems to be proprietary.||Automatic, "based on several factors".||Temporary. Has self removal as well as user delisting.||No||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, has self removal||No||Yes (partial)|
|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|
|Distributed Realtime Blocking List||drand DRBL node||spamtrap.drbl.drand.net||IP addresses used to send spam to traps or members||Automated [de]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
|Detects viruses by behavior using fake high MX and tracking non-use of QUIT||Automated [de]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|
|Quorum.to||ip-dnsbl||list.quorum.to. ( or per-subscriber: [id].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. Lists mailhosts, rather than domains, and thus blocks entire hosting providers and ISPs.||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|
|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|
|SRN:SurGATE Reputation Network||SRN||srnblack.surgate.net||Spam sources, relay abusers||Feeder servers||Automatic expiry (varies by type); webpage allows delisting||Removal requests are quickly and manually reviewed and processed without fees.||Yes||No|
|s5h.net Internet Services||s5h.net||all.s5h.net||Spam sources from email, forums, referrer spam and dictionary attacks||Traps||Twelve months unless ISPs request removal earlier||By request. ISPs can provide request exclusion||Yes||No|
|MegaRBL||RBL||rbl.megarbl.net||IP addresses used to send spam to traps||spamtraps, in order to avoid abusive reports (Competitors, false positive, etc...) only MegaRBL team can add an IP to the list.||Until delisting requested.||Removal requests are quickly and manually reviewed and processed without fees.||No||Yes|
|IPrange.net||RBL||rbl.iprange.net||Spam Trap||List of IP addresses that sends spam or causing troubles with botnets or phishing||Until delisting requested.||Removal requests will be investigated and processed within 24 hours of submission.||No||No|
|BarracudaCentral||RBL||b.barracudacentral.org||Spam Trap||Provides a list of IP addresses which are sending spam. The Barracuda Reputation system uses automated collection methods to add and delete IP addresses from the BRBL.||Until delisting requested.||Requires registration of administrator and hosts to use. Removal requests are typically investigated and processed within 12 hours of submission if provided with a valid explanation||No||No|
"Collateral Listings" - Deliberately listing non-offending IP addresses, in order to coerce ISPs to take action against spammers under their control.
"Notifies upon listing" - Warns the owner of the IP/Domain when they list an IP. (so owners can take action to fix the problem)
- "armresearch.com". armresearch.com. Retrieved 2012-05-06.
- UCEPROTECT® email@example.com. "UCEPROTECT®-Network - Germanys first Spam protection database". Uceprotect.net. Retrieved 2012-05-06.
- Simpson, Ken. "Getting Onto a Blacklist Without Sending Any Spam". MailChannels Anti-Spam Blog. MailChannels Corporation. Retrieved 16 September 2011.
- "sorbs.net". sorbs.net. Retrieved 2012-05-06.
- "The Cbl Faq". Cbl.abuseat.org. 2006-12-31. Retrieved 2012-05-06.
- RBL Check, RBL Check, Multiple & Real-Time
- Blacklists Compared, weekly reports since July 2001 (no new reports since 13th September 2014)
- Intra2net Blacklist Monitor, tracking more than 40 blacklists and giving weekly reports on hits and false positives
- Instant Multiple DNSBL Check Test, Open-to-use, Multiple DNSBL Check Test
- Multi-RBL Checking Tool, Multi-RBL Checker Tool (Check to see if your IP is showing up one or more RBLs)
- RBLTracker DNSBL Monitoring, Automated, Real-Time Black List Monitoring Service.
- SpamAssassin rule statistics, SpamAassassin's rule ham/spam ratios over time.
- List of all RBLs, Information about all existing blacklists including discontinued blacklists.
- Mail Server Blacklist Monitor, Blacklist monitoring service checking 150 blacklists, can be used freely.
- Barracuda Central, Devoted to sharing information with Barracuda Networks customers and the Internet security community.