All Gearset requests, regardless of which instance you are using, originate from one of these static IP addresses:
If you are on the US instance of the Gearset app, regardless of where you are logging in from you will also need access to these IP addresses:
If you are on the Australian instance of the Gearset app, regardless of where you are logging in from you also need access to these IP addresses:
Depending on your corporate firewall settings, you may need to add logins from these IPs to the allowlist for Gearset to be able to connect to your on-premise version control system or to orgs with IP access restrictions enabled.
You should allow TCP port 443 for HTTPS (or TCP port 22 for SSH).