You have to sign on to each LPAR with a profile that has *IOSYSCFG authority and then type CFGTCP on the command line and option 1 to view the interfaces. This will show you the IP addresses assigned to that LPAR and also the line description that that IP is using. You will have to hit F11 at least one to see the line description. The you can go to the WRKCFGSSTS *LIN xxxxx to see the line resources detail that that line is using.
If you have Operations Navigator installed on your PC you can run a “Discover Systems”. Open Management Central, Right click “Endpoint Systems” select Discover Systems from the Pull Down Menu.