While it wouldn't cover VPC clients you can get a max figure by looking at the number of ip addresses allocated to AWS. They list them all here: https://forums.

While it wouldn't cover VPC clients you can get a max figure by looking at the number of ip addresses allocated to AWS. They list them all here: https://forums.aws.amazon.com/ann.jspa?annID=1701 https://forums.aws.amazon.com/ann.jspa?annID=1701 I think the last time I did the math it worked out to something like 2M addresses in US-EAST.