Methods for Producing these Rankings

All data are provisional, and all results are tentative.

This research project collects outbound spam data per IP address daily from half a dozen anti-spam blocklists, collates it by ASN, extracts it by geography (world, U.S., etc.) and type (all, medical, financial, etc.), for a given time period (quarterly, monthly, weekly, daily) and ranks the resulting AS data, displaying it in tables and graphs.

The rankings displayed so far derive from custom spam volume data from the CBL and PSBL blocklists.

Collation from numeric IP addresses to netblocks and ASNs uses correlations provided by CBL and Team Cymru. Rankings version 2 (rankv2) does this collation more precisely per day than the older (retired after April 2013) version 1.

See the Acknowledgments and Disclaimer.