An enhanced location system uses both IP address (e.g., subnet) and user ID information (e.g., cookie) to differentiate, in view of historical information, a most likely location of a user. Using the IP information a part of a location inference key, the system quickly and easily filters the historical information to identify the location. Having the location enables the system to provide, in real time, location relevant answer or other results responsive to a user’s query.
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Voggenreiter, Oliver and Gupta, Ankit, "Determining User Location Using IP Address and Historical Device Locations", Technical Disclosure Commons, (June 07, 2017)