Has someone an address-list of all IP-blocks of google and amazon?
Update:
Found a list and a generic method by querying the SPF records in DNS:
All actual Google ipv4 and ipv6 adresses based on Google’s SPF records:
https://md5calc.com/google/ip
Same method should be applicable with any such companies.
This method not necessarily covers all their IPs, but still better than nothing.
Update2: here’s another method with even a bigger google list:
https://github.com/pierrocknroll/googlecloud-iprange