The standard query port nr. for teamspeak 3 servers is 10011.
This value is used by default when you add a new TS3 server within the app.
If it doesn’t work (means: connection to your team speak server is not possible) then you should ask your TS3 admin about the correct query port nr. An older default value in the past was 9011.
Do not confuse the query port with the virual server port of your TS3 server!