Do you want to know if a website is running on EC2? Use this tool to figure it out quickly.
For the domain acne.org, I found the following IP addresses:
72.3.253.230 - It's not running on EC2 - PTR points to 198397-web1.acne.org
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