@olamundo Hi!

I don't think there's a (official) list of Amazon IPs. But there is for AWS: https://docs.aws.amazon.com/general/latest/gr/aws-ip-ranges.html - it's more than 100M.

I don't know a good way of blocking that amount of IPs.

Also, there are AWS-based solution running behind non-AWS CDNs. That wouldn't be blocked using the above list.

In other words, I don't think there's a good way of doing this.