this is a tool checks ALL ports you can host it (P.S : the ports can take some time to be found)
http://www.ipfingerprints.com/portscan.php
you will only need to type the ports that you think about and then weeeeeeeeee , the ports show up
Note : the ports that haves "CLOSED" means can't be used (you can always try it but it won't work) and the "TIMED OUT" means that it works but no one can join , and "OPEN" mean that you can host it and others can JOIN !