Question A zone question, curiosity

The stock tbamud comes with zones listed to 654, I realized their are not actually 654.

My question is this, what is the max number of zones if someone was to get crazy and keep adding?

The room numbers and zone numbers are IDXTYPE, unsigned short int. This means that the highest room number is 65534 (65535 is "NOWHERE"). Given that there's a 100 rooms in a zone, the highest full zone is 654.

However, there's really not much that needs to be changed to change IDXTYPE to long, for instance. That would allow 2 147 483 647 rooms, or 21 474 836 zones.