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.
Other articles related to "cbl index, cbl":
... In CBL zone dated 2007-07-07T2103+0000 there was 166_086 IP addresses listed from 22.214.171.124/11 network ... The CBL Index for the net was 2_097_152/166_086 = 12.6 (*/28.3 11.0 dB) ...
Famous quotes containing the word index:
“Exile as a mode of genius no longer exists; in place of Joyce we have the fragments of work appearing in Index on Censorship.”
—Nadine Gordimer (b. 1923)