How can I check if my iPad is covered under warranty?

Apple covers your iPad under a Limited Warranty for one year from the original date of purchase. To check if your iPad is still covered under warranty use Apple's online service assistant:

https://selfsolve.apple.com/GetWarranty.do

Click the link above and enter your iPad serial number (S/N) and your country. Apple may ask to see proof of purchase documents to verify your iPad's warranty status before service is performed.

Check these instructions to look up your iPad serial number.