Hyper-V Default switch IP address range change. Ver 1809 Build 17763.1

Thanks again for sharing your observations Bala Sundaram .

I can confirm that the switch type does not determine assigned IP address class, as you suggest. Indeed, when using the Default Switch, my colleagues and I receive a mix of 192 and 172 addresses if we provision VMs repeatedly.

To work around this, we've had to implement scripts that run at the end of the provisioning process, within the VMs, to detect and set the IPv4 and gateway addresses statically.

If there's any upside to the Hyper-V Switch behavior, it's that once a static IP is hard-coded within the VM, Hyper-V seems happy to issue it to the client whenever the VM is powered-on.

That said, I have not tried rebooting the host machine, starting/stopping the Hyper-V service, etc. between VM boots to see if that behavior remains consistent...