SenderBase
http://www.senderbase.org/
A very useful website for my work to control spam. This website rates the volume of mail sent from a particular ip address and marks whether or not that is 'unusual' for it from past data trends. It also gives other identifying information such as which network it is part of, and whether it is currently blacklisted by anyone. So as such it does not blacklist anyone on its own, but publicizes an ip address' reputation, so that network admins like myself can make up our own minds about the source.
I use this to maintain a DNS blacklist server on my internal network, and my mail server rejects mail from blacklisted addresses.
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