There used to be an application used by torrenters called PeerGuardian and then PeerBlock, which was basically just that. It was a curated list of IPs that were

There used to be an application used by torrenters called PeerGuardian and then PeerBlock, which was basically just that. It was a curated list of IPs that were known to belong to domains at universities, companies, governments, etc. It probably had malicious domains in there as well.