Webhook incoming IP address?

I want to limit the access to the only open port in my router’s firewall. For Home Assistant to sync states with Rachio, Webhooks are needed. Everything used to work when access was limited to IP addresses and, but it looks like Rachio calls come from a different IP now.

Is this documented somewhere? Maybe someone has been able to determine the IPs used by Rachio to communicate with API integrations. The idea of leaving a port totally open to any “from” address does not sound safe at all… Thanks!

Answering my own question, for those using UniFi, the IPs for the two AWS addresses used by Rachio API Webhooks are easily found if you access you logs via SSH at /var/log/messages. They are in the 44.23*.. range. I hope they don’t change those often.