Mac Jim ID wrote:
The IP Address viewed on a website is the IP Address of your router, not your Mac. All devices that you use on your WiFi are going to broadcast the exact same IP Address. Your Mac does have a unique private IP address that is assigned by your router, but it is not sent to a website. You can view the IP address that is sent to websites by going here:
https://www.whatismyip.com/
To the OP: That address is unique within your local network – but it is far from globally unique.
When your Mac gets an Internet address like 192.168.0.1, that is in one of the special private ranges that is never routed over the public Internet. There might be 100 million other people who all have the address 192.168.0.1 for their computer, and who all have 256 IP addresses (192.168.0.0 – 192.168.0.255) available for their local use.
Your router plays a clever game with remapping IPv4 addresses and port numbers to make things all work, so no matter how much of that 192.168.0.* range you are using, you're only taking up one of the more valuable globally-unique IPv4 addresses.