Comment by xyzzy123

All the major cloud providers publish machine-readable lists of their ranges, e.g.

https://docs.aws.amazon.com/vpc/latest/userguide/aws-ip-rang...

https://www.microsoft.com/en-us/download/details.aspx?id=565...

https://support.google.com/a/answer/10026322?product_name=Un...

etc etc...