STEP1: Open this link in the iPad browser
Link: http://get.udid.io/
Step 2: click on "Get my UDID"
Step 3: It will Pop up for a download profile and please hit on "Download" and click "Continue"
Step 4: Then it will navigate to the installation page, please tap on Allow.
Step 5: Profile downloaded pop-up will appear please close it and navigate to "Settings"
Step 6: In settings please navigate to "Profile Downloaded" and click on "Install" and enter the passcode.
Step 7: The device information will be displayed with the "UDID"