Hi,
The list of source IP addresses in use by hosted grafana is published via DNS answers for src-ips.hosted-grafana.grafana.net and at https://grafana.com/api/hosted-grafana/source-ips
To get the list of IPs you can use the command:
host src-ips.hosted-grafana.grafana.net | cut -d' ' -f4
or
curl https://grafana.com/api/hosted-grafana/source-ips.txt
To get the list of IPs in Json format:
curl https://grafana.com/api/hosted-grafana/source-ips
Marcus