Well, you can delegate these as 128 individual zones. With a little bit of automation to help, it may approach practical. You can delegate a single domain name in the limiting case.

Are you sure that is legal? I believe some DNS code will detect a zone delegation which isn't a subzone to be a delegation loop.

Well, you have to delegate to a real zone. Like I said, with a little bit of automation, you can set up the 128 zones on the subzone server(s) to accomodate this. louie