LOL. You can see a LOT more than just the router.
It would be trivial to create a hash of some sort based on IP, screen resolution, color depth, browser name, browser id, and then to make sure cookies must be enabled. (Yes, this is not a great hash, but it is only slightly less trivial to make a usable hash that identifies a machine more clearly)
That is much what microsoft does. It lets them say that they don't really "Identify" your computers - but it also lets them identify (to some extent) whether their software is on the same machine or not the next time it's installed.



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