The latest RBLmon news + some useful details on the RBLs we monitor.

RBL Information


Since 28-Oct-2016, we’ve been receiving reports of inconsistent results from the following blacklists: – – – – Upon further investigation of these reports, we found out that the above RBLs had stopped responding to DNS queries and presently return null results when looking up their A DNS records. This can be confirmed...

The Composite Blocking List (CBL) is a very effective DNSBL that blocks email from exploited computers. The CBL takes its source data from very large spam traps and mail infrastructures, and only lists IP addresses that exhibit characteristics, which are specific to open proxies, viruses, stealth spamware applications loaded on a computer without the user’s...

“Fiveten” ( is a blacklist run by Carl Byington, who operates under the name of “510 Software Group.” This blacklist has been around for a decade now. It lists IP addresses for a large variety of reasons.

The SpamCop Blocking List (SCBL) lists IP addresses which have transmitted reported email to SpamCop users. SpamCop, service providers and individual users then use the SCBL to block and filter unwanted email. The SCBL is a fast and automatic list of sites sending reported mail, fueled by a number of sources, including automated reports and...

The only way you can get into SpamCannibal’s database is by sending spam or virus ladened email.

For years, this blacklist included IP addresses, which belong to ISPs that do not provide a method of contacting them. On September 13th, 2010, its creator Jeremy Bettis announced on his blog that the blacklist is no longer maintained and urges all ISPs to stop querying its DNS database.

Starting in September 2008, Barracuda Networks introduced the Barracuda Reputation Block List (BRBL – pronounced “bahr-bel”) as a free DNSBL of IP addresses known to send spam. Barracuda Networks fights spam and created the BRBL to help stop the spread of spam.
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