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Re:API providing threat analysis of any given IP address by aianus on Saturday August 06, 2016 @11:51PM (#12240973)
The IP of a Tor relay is publicly distributed, that's how other nodes know to connect to it.

You can see for yourself: https://atlas.torproject.org

Re:API providing threat analysis of any given IP address by phaedrix on Sunday August 07, 2016 @10:41AM (#12242196)
Although at a guess, most of these services probably do the simplest thing possible and go by an open port.