Do you want to know if a website is running on EC2? Use this tool to figure it out quickly.
For the domain audacity.sourceforge.net, I found the following IP addresses:
216.34.181.96 - It's not running on EC2 - PTR points to projects.sourceforge.net
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