This documentation shows how to get the server ID string for the machine.

Navigate to the following directory:

%APPL_TOP%fnd11.5.0secure<SID>_<nodename>

e.g.

cd D:TESTTestapplfnd11.5.0secureTEST_oraclesrv

Open the <SID>.dbc (TEST.dbc) file using Notepad and you should see a line:

APPL_SERVER_ID=FE15648D7571C5C9E030005A1B00247727514667901730551185199646909747