[luhn]

All public traffic is NAT’d through AWS’s Blackfoot servers, EC2 instances are not directly assigned public IP address. (you won’t see the public IP in ifconfig, only the private IP) So there is little to no subnetting happening in Amazon’s public IP space, as a small cluster of machines are assigned the entirety of the DC’s public IP block.

[ArchOversight]

I don't disagree with that, I was simply explaining to the asker why IPv4 can be wasteful when it comes to how IP space is allocated usually.