How Can I Use A Different Static Dhcp Range On A Linksys Router

My understanding is that a Linksys router allows users to use static DHCP ranging from 192.168.1.100 to 192.168.1.244. But my customer wants to use their company’s own static IP of 105.66.x.x.

How do I set a wireless router to support the specific demand? Or what should I do to display users’ private addresses on their device/computer? Do I need a kind of IP mapping program?

Hopefully someone can help me. Thanks!