A vehicle identification number (VIN) decoder (VDC) implementing a unique VIN decoding method may, for a given VIN, shorten the VIN and form a stem and a leaf therefrom. Utilizing the stem, the VDC may operate to find matching leaf values, if any, from a set of look up tables. Depending upon a match outcome, one or more trim identification code (TIC) values can be assigned to the VIN and a candidate list can be constructed utilizing the assigned TIC value(s). The candidate list, which can be optimized, may contain one or more candidate trims for the VIN. For each candidate trim, a confidence score and a match probability can be generated. The VDC may provide decoded information containing trim data associated with at least one of the one or more candidate trims for the VIN to a client device over a network connection.