If the iPad is working properly:
- Navigate to Settings -> General -> About
- The Serial Number is listed towards the bottom of the page, along with other information.
If the iPad will not turn on or reboot properly:
- Your serial number is printed on the back of your iPad.
If unable to see the iPad S/N label:
- Run iTunes on your computer
- Plugin your iPad to your computer.
- iPad serial number (S/N) will appear in the iTunes information.