There are a few options when trying to find out this information… one way would be to go right to the registry and look at the TCP settings:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL.
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL10.
How to change TCP/IP port:
Open SQL Server Configuration Manager and expand the SQL Server Network Configuration, then select Protocols for MSSQLSERVER (default instance) in the right hand pane, you’ll see your protocols (Shared Memory, Named Pipes, TCP/IP, VIA).
If you double click on TCP/IP, the TCP/IP Properties dialog box will appear and by selecting the IP Addresses tab you will now see your IP addresses and which TCP port they are running under.
If you need to change this port number, make sure you restart the SQL Server service as this change will not take affect until you do.