Hi Sanjeev,
the port is maintained by basis people while installation. As hareesh said
port must be 5<instance number>00. suppose instance number is 05 then 50500, 00 then 50000
if you are on a dual stack PI system-- then
1. open SAP LOGON PAD (GUI).
2. right click on Pi system entry->click properties you can see instance number
3- else you can logon to PI system in Logon pad and then go to transaction - smicm
there you can find http and https entries of your system with port
if you are on a single stack system
you better ask the Basis team.
Regards,
Vikas Kumar Singh