Are you maybe thinking of MAC addresses? That would be closer being the “identity” of a device and you can typically identify the manufacturer from it. You can’t see the MAC address of a remote router via the internet though unless you are on its local network.
An IP address is usually a temporary lease provided by your ISP, and residential connections usually get a new one every once in a while (like every 24 hours).
My Starlink provider changed every few days but my new fiber connection has been unchanged for 6 months since I got it. I have taken advantage of that and have hosted some stuff on a domain that’s pointing back to that address and port forwarded.
Are you maybe thinking of MAC addresses? That would be closer being the “identity” of a device and you can typically identify the manufacturer from it. You can’t see the MAC address of a remote router via the internet though unless you are on its local network.
An IP address is usually a temporary lease provided by your ISP, and residential connections usually get a new one every once in a while (like every 24 hours).
My Starlink provider changed every few days but my new fiber connection has been unchanged for 6 months since I got it. I have taken advantage of that and have hosted some stuff on a domain that’s pointing back to that address and port forwarded.