Abstract: Class information is leveraged to facilitate in grouping identifications (ID) to allow ID range-to-class mapping information to be determined. ID range-to-class inference techniques are employed to determine similarities of IDs associated with a class, creating ID range-to-class mapping. Identifications can include Internet Protocol (IP) addressing, telephone numbers, and other sequenceable forms of identification for users and/or computing devices. Classes can include user location, age, income, gender, language, and/or other classifications. Thus, IP address ranges, for example, can be mapped to user geographic locations using an inference technique, specifically a “GeoInference” technique. The inference techniques quickly detect IP proxy usage and identify and eliminate outliers within a given IP range, substantially increasing the accuracy of user location data. Complementary data sources can be employed to facilitate in increasing data accuracy.