I also recently learned they publish changes to their IP netblocks almost daily as part of their new "please use more SNS" blog post: https://news.ycombinator.c

I also recently learned they publish changes to their IP netblocks almost daily as part of their new "please use more SNS" blog post: https://news.ycombinator.com/item?id=35056973 https://news.ycombinator.com/item?id=35056973 For example: https://aws-new-features.s3.us-east-1.amazonaws.com/update/2023-05-26.json https://aws-new-features.s3.us-east-1.amazonaws.com/update/2... (see the `NEW_ip_prefixes` and `ip_prefixes_REMOVED` keys)