I think it goes deeper than that. Even here in the UK with its heavily centralized PoPs it's possible for geolocation tools to narrow a consumer down to a speci

I think it goes deeper than that. Even here in the UK with its heavily centralized PoPs it's possible for geolocation tools to narrow a consumer down to a specific town (my cable connection tends to get geolocated to a big town 20 miles from me though) so I assume databases of locations of PoPs are maintained somewhere too.