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The Learning Center

The Composite Blocking List

Summary Status: Active Terms: Free Zones: 1 Website: cbl.abuseat.org Removal: cbl.abuseat.org/lookup.cgi Lookup: cbl.abuseat.org/lookup.cgi Background The CBL, otherwise known as The Composite Blocking List is a DNS based blacklist similar to the majority of other DNS based blacklists. The CBL does not list URL’s or URI’s, and like other DNSBL’s lists large quantities of IP addresses.…

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Bogons Block List

Summary Status: Active Terms: Free Zones: 3 Website: www.team-cymru.org/bogon-reference.html Background bogons.cymru.com is several things, one of which is a DNS based blacklist. Before you can use bogons.cymru.com as a DNS blacklist, it is important to understand what a “bogon” actually is. A bogon is in internet address prefix that should never appear in an IP…

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Barracuda Central Reputation Block List

Summary Status: Active Terms: Free by request Zones: 1 Website: www.barracudacentral.org/rbl Lookup: www.barracudacentral.org/lookups Removal: www.barracudacentral.org/rbl/removal-request Contact: www.barracudacentral.org/contact/feedback Background The Barracuda Reputation Block List, also known as The BRBL, has been in public deployment since 2008. Barracuda Networks is a manufacturer of a hardware anti-spam appliances. Reports have been made that The BRBL is highly accurate,…

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Backscatterer List

Summary Status: Active Terms: Free Zones: 1 Website: www.backscatterer.org Lookup: www.backscatterer.org/?target=test Removal: www.backscatterer.org/?target=test Contact: www.backscatterer.org/?target=contact Background ips.backscatter.org, working in cooperation with uceprotect.net is different than most DNS based blacklists. ips.backscatter.org does not maintain a list of IP addresses that have been seen spamming, sending email to honeypots, spamtraps, or any of the other general tactics…

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APEWS List Details

Summary Status: Active Terms: Free Zones: 2 Website: www.apews.org Lookup www.apews.org FAQ: www.apews.org/?page=faq Background Most spam advisory and blocking systems work after the fact. There is a time lag between the spammer setting up shop, spamming millions, and getting netblocks listed by these systems. APEWS identifies known spammers and spam operations, listing them as soon…

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The Abusive Hosts Blocking List Details

Summary Status: Offline as of late 2014 Terms: Free Zones: 1 Website: ahbl.org Lookup or Removal: ahbl.org/lktool FAQ: ahbl.org/documents Contact: ahbl.org/aboutus Background dnsbl.ahbl.org, otherwise known as The Abusive Hosts Blocking List is a DNS based blacklist. The AHBL started in 2003, and is a division of the Summit Open Source Development Group. According to The…

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How to Remove an IP Address from a Blacklist

(Go to our Blacklist Check page to find out if your IP address is listed on an anti-spam database. This article explains why that happens and how to get off a blacklist.) Each blacklist database has its own criteria for flagging IP addresses and compiling its own list of online offenders. Those criteria could include…

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Malware is Everywhere. Keep it Off YOUR Computer

Malware Damages More than Your Computer

When it comes to software, most of us know only that software programs—we also call them applications or computer programs—help us to do all of the important things we do on our computers. We couldn’t live without our spreadsheets, writing programs and Internet browsers, because that’s the software that helps us take care of business…

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