Do subscriber radios need an IP address?

Do I need to assign a 450i subscriber an IP address? Or will I be able to manage it via the web GUI and cnMaestro through the AP?

While you could manage SM's with default IP information via the AP backdoor from the sessions or link status list, forĀ  cnMaestro you will need to have unique IP's and be onboarded in order for you to manage them. If you're using the cnMaestro cloud services, the SM's will have to have valid ip's, gateway and DNS and be able to reach cloud.cambiumnetworks.com.