DHCP address ranges with NAT.....can they be changed?

By default I believe (correct me if I am wrong here) , you are only allowed IP addresses starting with 10.0, 172.16, and 192.168. I have a need to distribute a different range due to some of the older equipment we have with "pre set" addresses in a different range. Can the ranges offered by this unit be varied to something else that is not "predetermined"?

AirPort Extreme

AirPort Extreme

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