I'm not too sure, it creates its own separate wifi network and needs to be connected to the main wifi to work. Here's an image. DBD WIFI is the name of the extender and the community fibre below it is the main wifi network. All I know that the extender is an eero.
It says that printer is offline when connected to DBD WIFI, only prints when connected to the community fibre wifi (main wifi).
Not quite sure what you mean by subnetting or address space, let me just double check the meanings.
Thanks!