Public IP Range for Redis Cache

we are unable to connect to Redis Cache due to port 6379 and 6380 blocked on our corporate firewall. In order to unblock we need list of all ip for cache.
Is there a way we can get the list of ips ? we have large number of redis cache instances deployed. its not possible to keep checking the ip for every cache as the ips keep changing.
This is affecting our production environment.
Can someone please suggest on how to resolve this issue ?

No repository file, test, or entry point is named. Start by investigating Azure Redis Cache networking for ports 6379 and 6380 and the changing addresses of multiple cache instances. Done would require a confirmed, supported way to allow the required connections and clear guidance for affected users.

Written by the indexing model from the issue text.