CBL Index

The CBL Index is a ratio between the number of IP addresses in a given IP subnet (Subnetwork) to the number of CBL (Composite Blocking List) listings in the subnet. It may be used to measure how "clean" (of compromised computers) a given subnet is.

The higher the number is, the "cleaner" the subnet.

The CBL index may be represented in Decibels (dB) or as CIDR suffix (*/xx).

Note: other spam researchers prefer to use a percentage of IPs that are listed in a subnet. Using percentages is better suited for "unclean" subnets because "clean" nets have significantly less than 1% of addresses listed.

Read more about CBL IndexRationale, Example

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CBL Index - Example
... In CBL zone dated 2007-07-07T2103+0000 there was 166_086 IP addresses listed from network ... The CBL Index for the net was 2_097_152/166_086 = 12.6 (*/28.3 11.0 dB) ...

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