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Re:API providing threat analysis of any given IP address by toast0 on Sunday August 07, 2016 @02:00AM (#12241231)
If you have a BGP feed, you can use that to go from IP -> ASN, otherwise, there are public bgp dumps [1]. Many networks renting servers are pretty simple to flag this way.

[1] One source is http://www.routeviews.org/

Re:API providing threat analysis of any given IP address by ThePhysicist on Sunday August 07, 2016 @06:34AM (#12241694)
Thanks for pointing this out, I couldn't find a way to get the ASN for free, so this is a great resource!