Over the weekend I was reading about tracking IPs and I came across an article about using the ASN to track spammers.
The Autonomous System Number, or ASN was originally developed to help route traffic on the Internet, but it is a unique identifier that is used to group IPs into routing groups. This helps to create a single unique number that can be used to identify all of the IPs for an ISP or other organization.
I’m working on a tools to leverage the ASN in the IP database I want to be able to see how many IPs from a certain ASN are currently listed in RBLs. This and which country they are coming from will give an idea of where in the world spam originates and which ISPs have the biggest spam problems.