How to obtain your MAC Address / HOST id
Hostid (the MAC address of your supervisor):
The ethernet MAC address of your supervisor is necessary in order to cut keys for Qube! versions 6.0 and onwards. See MAC_address for more info about MAC addresses.
If you are already running a Qube! supervisor and QubeUI, you can find the MAC address with QubeUI->Administration->Ping Supervisor.

If you're unable to use the UI, you can also look for the following line in the supervisor's supelog, printing just as the service starts booting, to find out which one it's using:
INFO: mac address: 00:50:56:C0:00:08
Or you can determine the MAC address via the operating system's command-line utilities.
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Linux and macOS:
/sbin/ifconfig -
Windows:
ipconfig /all