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
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