What ports does the ad hoc server utilize?

[tywald]

Ad hoc server uses TCP port 27312 which I think you already know, in the case of PPSSPP:

One way to see some ports is to open up Resource Monitor and see the "Listening Ports" tab. Start a game and join a lobby and it should show at least one, for Monster Hunter it should show UDP port 10000. If you enter a quest more ports should show up, in the case of Monster Hunter UDP ports 20001-20004 should show up.

It's a start at least.