Decode a boat HIN to identify the manufacturer code, hull serial number, build date, and model year before buying, selling, registering, or insuring a boat.
Decode a Hull Identification Number before buying, selling, registering, or insuring a boat
Enter the 12-character US HIN from the starboard side of the transom. Spaces and hyphens are removed automatically.
A Hull Identification Number is the boat hull's unique identifier. A US HIN is usually 12 characters long and can identify the MIC manufacturer code, hull serial number, build or certification month, build year digit, and model year.
Use HIN for the boat hull and VIN for the trailer. If you are researching the boat itself, decode the HIN. If you are researching the road trailer, use the [Boat Trailer VIN Lookup](/resources/boat-trailer-vin-lookup). Mixing them up can send you to the wrong records and the wrong value workflow.
Use this table to understand what the decoder is reading from the hull number.
| HIN position | Segment | What it means |
|---|---|---|
| 1-3 | MIC | Manufacturer Identification Code assigned through the USCG system. |
| 4-8 | Hull serial number | Builder-assigned serial number for that hull. |
| 9 | Build/certification month | A through L for January through December in the modern US format. |
| 10 | Build/certification year digit | Last digit of the build or certification year. |
| 11-12 | Model year | Two-digit model year for the boat. |
Older boats can have legacy HIN formats. Treat the result as a first-pass decode and confirm it against paperwork.
Start on the starboard/right side of the transom near the top. Many boats also have a hidden secondary HIN in a manufacturer-known location.
Enter the full HIN without spaces or hyphens. The tool decodes the MIC, serial number, build date, and model year.
Match the HIN against title, registration, bill of sale, insurance documents, and the seller listing before making a decision.
A HIN does not normally encode engine model, exact boat model, option package, ownership history, accident history, liens, or current market value.
If the question is about the road trailer under the boat, use the trailer VIN instead. The trailer VIN is 17 characters and follows a different lookup path than the boat HIN.
No. HIN identifies the boat hull. VIN identifies the road trailer or vehicle. People often search boat VIN lookup, but the correct term for the boat itself is HIN.
A HIN can confirm hull identity, build date, and model year, but value still depends on condition, engine, hours, equipment, title, local demand, and comparable listings.
No. HIN decoding does not verify ownership, liens, theft, accidents, or title status. Check state title records, registration documents, and paid history services when needed.
The primary HIN is usually on the starboard/right side of the transom. Boats may also have a hidden secondary HIN placed by the manufacturer.
Treat that as a serious paperwork risk. Ask for title and registration records and check your state process before buying, selling, or insuring the boat.
Use the HIN to confirm boat identity and dates before you rely on a listing, title, registration, or insurance estimate.
Compare Trailer VIN LookupHIN decoding is informational and does not verify title, liens, ownership, or market value.
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Reviewed by Premium Boatcare Team