AirPort DHCP range with customized

Sorry, but when the AirPort does DHCP and NAT, it is not possible to assign a DHCP range of 192.6.1.x on any of the Apple routers.

The ranges that you see in AirPort Utility are the ranges that you must use.......10.0.x.x / 172.16.x.x / 192.168.x.x

The only exception to this that I can think would be a situation where you have a fixed, static bank of IP addresses to use provided by your ISP (very rare these days) or a separate DHCP server providing static IPs to use.

Not sure if you are familiar with Apple routers, but "advanced technology" could hardly be used as a description for the extremely limited features of Apple routers.....designed for easy use by "mom and pop".....that these products provide.

Or any environment where users want to track Internet use by individual user, limit bandwidth per device, set up parental controls, and the list goes on.