Calendar Interop now uses a restricted set of IPs

We built Calendar Interop to enable user availability lookups between Google Calendar and Microsoft Exchange. Last summer, we introduced a wide array of improvements to the product, such as simplified setup and troubleshooting, real time updates, and support for both web and mobile. To help our customers improve the security of their coexistence setups, Calendar Interop will now use a restricted set of known IPs to communicate with Exchange servers.

By restricting Calendar Interop to this set of known IPs, G Suite customers can now block all incoming traffic (e.g., by setting up a firewall) to their on-premise Exchange servers, except for requests originating from Calendar Interop.

To see the list of IPv4 and IPv6 addresses that belong to Calendar Interop, check out this Help Center article.

Launch Details
Release track:
Launching to both Rapid Release and Scheduled Release

Available to all G Suite editions

Rollout pace:
Full rollout (1–3 days for feature visibility)

Admins only

Admin action suggested/FYI

More Information
Help Center: About Calendar Interop

Launch release calendar
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