Can more than one computer share the last three digits in an IP address?

[Duncan]

If xx.xx.xx.132 is your external IP address then all the computers in your home will use that when connecting out to the Internet. The router allocates an individual IP address to each device connecting to the network internally and routes (hence the name) the incoming connections from xx.xx.xx.132 to the right device.

The internal addresses are usually 192.168.0.1, 192.168.0.2, 192.168.0.3 etc.

The IP address you use is not fixed and belongs to your ISP not you. The ISP can reallocate an IP address at any time. You may be using xx.xx.xx.132 today and someone else miles from your location may be using it tomorrow.