When you need the literal IP addresses for Google Cloud Platform, use one of the common DNS lookup commands (e.g. nslookup, dig, host) to retrieve the TXT records for the domain _cloud-netblocks.googleusercontent.com:
$ nslookup -q=TXT _cloud-netblocks.googleusercontent.com 8.8.8.8
This returns a list of the domains included in Google's SPF record, such as:
_cloud-netblocks1.googleusercontent.com, _cloud-netblocks2.googleusercontent.com, _cloud-netblocks3.googleusercontent.com, _cloud-netblocks4.googleusercontent.com,_cloud-netblocks5.googleusercontent.com
Next, look up the DNS records associated with those domains, one at a time:
$ nslookup -q=TXT _cloud-netblocks1.googleusercontent.com 8.8.8.8
$ nslookup -q=TXT _cloud-netblocks2.googleusercontent.com 8.8.8.8
$ nslookup -q=TXT _cloud-netblocks3.googleusercontent.com 8.8.8.8
$ nslookup -q=TXT _cloud-netblocks4.googleusercontent.com 8.8.8.8
$ nslookup -q=TXT _cloud-netblocks5.googleusercontent.com 8.8.8.8
The above results will return you a list of IP Range, once consolidated this will be the GCP IP ranges used.
Note: GCP does not provide any mapping between the IP range to their corresponding zones
If you require further assistance regarding this, please contact the Symphony Support team at support@symphony.com