You can block 17.0.0.0 at the router, opening up only the notification servers. CDNs are a bit harder, but can be done with dnsmasq allow/deny of wildcard doma

You can block 17.0.0.0 at the router, opening up only the notification servers. CDNs are a bit harder, but can be done with dnsmasq allow/deny of wildcard domains. Apple has documentation on network traffic from their devices, https://support.apple.com/en-us/101555 https://support.apple.com/en-us/101555