Pre-Requisites:
Installation of iTunes on the Windows Device
Steps to follow in obtaining UDID for the iOS Device:
1. Connect iOS device to iTunes and on "Summary" screen the "Serial Number" is visible.
2. Click on the "Serial Number" and then "Identifier (UDID)" of the iOS device is shown.
3. Note down the 40 character UDID which doesn't start with FFFFFF.....
(please see the attachment)