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You find it in Windows without iTunes and without USB View.
-Connect the iDevice in Restore mode
--Turn the device off
--Hold the Home button while connecting the USB cable
--Keep holding the home button until a "Connect to iTunes" picture appears.
- In Windows, open the Device Manager
- Change the view to "Devices by connection"
- The iDevice will appear as a USB composite device, containing two unrecognized devices (unrecognized if the system doesn't have iTunes because the driver software will not be installed)
- Double-click the USB composite device and go to the "Details" tab.
- You will see many text strings containing cryptic device IDs and other information.
- Look for the one containing "ECID" and 16-charcter number after that is the ECID.