This looks to me like Route 53 going straight to EC2, with no ELBs. Amazon own a lot of the 54.x.x.x IPv4 addresses, which is often a hint.

I like (and trust) DDG, and use it all the time. But it is interesting to know who else has access to their infrastructure.

I was surprised by the AWS result, as I expected them to co-locate their own dedicated hardware.