<p>The subnet should give you a somewhat generalized geographical range, leasing companies operating within these subnets can be looked up and a probabilistic range of operation be determined (there are various records that one can use to look up these information). If the client leases various shared lines that dynamically switches, it’s theoretically possible to triangulate a rather specific address of any given internet user by logging their various IPs (and excluding the areas that do not overlap). The problem here however is to discount the anomaly addresses made by a user using a different connection. I’m quite sure several companies have already started something along these lines for locational services, as they were pioneered almost a decade ago.</p>