[javajosh]

Does Tor use it's own port? If so, how hard would it be to switch it to use something like 80, 23, or even 8080?

[aianus]

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

[phaedrix]

Although at a guess, most of these services probably do the simplest thing possible and go by an open port.