Amazon previously kept a semi-official list of all netblocks for EC2 in their forum. They've recently moved to posting updates as official announcements, here i

Amazon previously kept a semi-official list of all netblocks for EC2 in their forum. They've recently moved to posting updates as official announcements, here is the latest: https://forums.aws.amazon.com/ann.jspa?annID=877 https://forums.aws.amazon.com/ann.jspa?annID=877 It's interesting to see the size of their deployments measured in usable IP space.