What ports should be open for gamers

[TunTuri]

Help me out here, I'm organizing a lanparty, and the Internet connection provided to us is almost totally blocked, only some generig traffic like http on ports 80, and 81 goes through.. So I have to build a list of ports what I have to supply to the network admins, so they could open those for us..

 

So please help me to fill

[Scarface]

irc authentication port 113 TCP

[BOTA:X]

TS, Vent and Games will vary based on what port the server is on because often there is more than one server on an IP.