Described herein are a method and a system to assign geographic locations to network blocks. A particular embodiment of the system includes a set of intermediate assignment generators, each intermediate assignment generator being associated with at least one of a plurality of network data sources, each intermediate assignment generator being configured to generate an intermediate assignment for at least one of the plurality of network data sources, a set of classifiers each coupled to at least one of the intermediate assignment generators, each classifier being associated with at least one of the plurality of network data sources, each classifier being configured to generate at least one classification based on at least one of the intermediate assignments and corresponding training data, and an intermediate assignment selector to select a best intermediate assignment based on the classifications generated by the set of classifiers, the best intermediate assignment corresponding to a geographic location of a network block.