1. whatismyip.com
Use your internet explorer and open http://www.whatismyip.com. It will show your public IP address. This website can do more than one task and is really very helpful in daily life for IT operations.
2. cmyip.com
Its a very simple and easy to use website, you just need to open internet explorer and enter http://www.cmyip.com web address to see you public IP address.