Do you want to know if a website is running on EC2? Use this tool to figure it out quickly.
For the domain www.ec2ornot.com, I found the following IP addresses:
10.249.70.225 - It's running on EC2! - PTR points to domU-12-31-39-03-45-13.compute-1.internal
Some EC2 sites: Some surprising sites that aren't running EC2:
- info.rightscale.com - apparently they only eat some of their own dogfood
- www.amazonaws.com