MDM Management is out of control

I think you may not understand MDM or networking. If your devices are owned/managed by a company/school/other institution they can configure MDM profiles to manage their devices. An ip address starting with 192 just means it is one of three private networks used by any organization/company. A 192 ip address is not nefarious or suspicious. There are millions of private networks using ip addresses starting with 192.

192 starting address is usually your home/private network address which your router or modem automatically assigns to your devices (computer, phone etc) ...

If your device is MDM managed, then it either belongs to the company you're working for, or, at one time it did belong to a company and they didn't release MDM management on their devices before selling them.

You're not in any unknown "block". Almost every single router sold has the self address of 192.168.0.1 (Xfinity uses 10.0.0.1). Every device you use to access that router then gets assigned an unused number by the router in a range so they don't conflict. Your Mac may be 192.168.0.10, and your phone 192.168.0.43.

IANA has nothing to do with your devices. Zero. Nada. Zip.