This is only true if you have 1 computer in direct contact with the internet thru the ISP modem. Get around this by turning off/on your router every now and then.
If you have a router with multiple computers/devices connected, the router will almost always have the same IP address down to about 5 or 6 digits, then it adds the remaining digits to correlate to the additional devices connected to the router.
You can get around either of these scenarios by turning off your router every now and then. The ISP will then assign an IP address to the router which more than likely will not be the same one as before, mathematically speaking.
On the IP tracking aspect. It depends on which ISP you use. With my serivce provider every time I reboot my computer I have a different IP address. Just Google "whats my IP" and you'll see it. reboot your computer and do the exact same "whats my ip" and see if its different.
Originally Posted by LongStick