Dynamic blacklisting portal of the
Institute for Internet Security

Nowadays spam is an old topic, but still it is a rising problem. Spammers manage to circumvent current anti-spam installations and harm by consuming resources, damaging the reliability of email as a communication instrument and tricking recipients into reacting to spam.

In the context of anti-spam blacklisting describes the process of blocking upcoming SMTP connections from spammers, which are contained within a list of IP addresses (blacklist).

The most common blacklists are DNSBL, which is an acronym for “Domain Name System Blocking List”. The name results from the technique how these lists are used:
When receiving an SMTP connection attempt the MTA usually requests via a special DNS record to a DNSBL whether the queried IP address is blocked or not.

We compare the well-known blacklists and make this information available for you.

You can use the following services:

• intersection array:
  Get an overview which amount of IP addresses listed in a blacklist is covered by another blacklist.
  
  
• regional views:
  Statistics about IP blacklist entries grouped by countries,
  respectively grouped by autonomous systems.
  

  The respective view shows which country/autonomous system has listed how many of its advertised IP addresses on each blacklist.

Further information:
Slides of Christian's talk at RIPE Meeting 55 are available as PDF.

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