As an administrator, when you need to obtain a range of IP addresses for Google APIs and services' default domains, you can refer to the following sources of information.
- The complete list of IP ranges that it announces to the internet. Learn more
- A list of Google Cloud customer-usable global and regional external IP address ranges. Learn more
The default domains' IP address ranges for Google APIs and services fit within the list of ranges between these 2 sources. (Subtract the usable ranges from the complete list.)
For more details on obtaining Google IP address ranges, see: