If it is not connected to the internet then you can just use ULAs without any problems. You can even set up a registry and use ULA-C space. https://en.wikipedi

If it is not connected to the internet then you can just use ULAs without any problems. You can even set up a registry and use ULA-C space. https://en.wikipedia.org/wiki/Unique_local_address https://en.wikipedia.org/wiki/Unique_local_address