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+1 for this. Grouping by ASN and netblock owner would be nice as well. I'm happy to shoot down entire ISPs.

Do you know where maps between IP addresses and ASNs/netblocks might be available for download? I can't immediately find this on IANA's website or on those of the RIRs, and I think it'd be too much to grab from whois.

Arin will allow you to download portions of their database for research purposes, but it requires an account and it looks like there's an approval process.

You wouldn't have to query every IP, you'd just have to query IPs not covered by a result range from a previous lookup.

I'd be willing to help on this; I have a whois module I wrote for another spam tool, I should be able to pretty easily adapt it for this.

http://www.routeviews.org provides access to live and snapshot BGP data.

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