Free HIN Decoder: What a Boat Hull Identification Number Actually Tells You
A HIN decodes to four things: the builder's code, the hull serial, the month and year the hull was certified, and the model year. It does not decode to accident history, salvage status or liens, because no consumer register of those exists for recreational boats. This tool decodes the first four and tells you exactly where to look for the rest.
- 12
- Characters, decoded in your browser
- 0
- Data sent anywhere, nothing stored
- Free
- No email, no account, no gate
- 1972
- Boats before November are exempt
What a hull identification number is
A hull identification number is the 12-character code a builder must stamp on a recreational boat's hull under federal rule, 33 CFR Part 181. It identifies the hull the way a VIN identifies a car, and that is where the resemblance stops: a VIN opens a commercial history file, and a HIN does not, because no equivalent file exists for boats.
The format, the placement and the exemptions all come from one place, 33 CFR Part 181, subpart C, which is worth reading if a seller tells you the rule says something it does not.
Decode a hull identification number
Paste the 12 characters from the transom. Everything runs in your browser, nothing is sent to us or stored.
Boats built or imported before 1 November 1972 have no HIN at all. If a seller cannot produce one for a boat of that age, nothing is wrong. If a seller cannot produce one for a boat built after it, that is the finding.
The three characters at the front are the builder's code. We do not mirror the Coast Guard's list of them, because it is a search form with no published licence and a guessed builder name is worse than none, so resolve yours on the USCG Manufacturer Identification Code search and check the company is who the seller says it is.
The four-part structure, where the second hidden HIN is stamped, and why the certification date and the model year legitimately differ are all set out on our boat bill of sale generator, which validates the same field on the document itself.
What a HIN cannot tell you, and what can
There is no boat equivalent of a vehicle history report, and the sites selling one are aggregating partial state feeds without publishing what they cover. A HIN identifies a hull. Everything a buyer actually worries about lives in a different record, and each of those records is public.
| What you want to know | Does the HIN say? | What actually holds it |
|---|---|---|
| Has it been in a serious accident? | No | The insurance claim history, which only the owner can pull, and a surveyor's read of the repairs |
| Is there a lien against it? | No | State title records, and for a documented vessel an abstract of title from the Coast Guard |
| Was it a salvage or total loss? | No | State title branding, which varies by state and does not follow the boat across every border |
| Was it flooded in a named storm? | No | A survey. Storm exposure leaves physical evidence long after paperwork stops showing it |
| Who built it? | The code only | The Coast Guard MIC search resolves the three-character code to a company |
| When was the hull certified? | Yes | Positions 9 and 10, decoded above |
| What model year is it? | Yes | Positions 11 and 12, a separate field that legitimately differs from the certification date |
| Is it the boat on the paperwork? | Yes | Match the transom HIN to the hidden second HIN and to every document. A mismatch is the single most useful thing this page can find for you |
One federal search does take a HIN, and its scope is narrower than it looks. The Coast Guard's PSIX vessel search covers documented and commercial vessels, which is fishing boats, passenger vessels and tankships rather than the average recreational hull. It is worth checking and it is not a boat history report. If the boat you are buying is not in it, that tells you almost nothing.
Why the HIN is an underwriting question before it is a price question
The HIN sits on the proposal form, and it is not administrative. It fixes which hull is being insured, and it is the field that quietly decides whether a quote survives contact with the documents.
- A HIN that does not match the bill of sale, the title and the transom stamp stops a placement while it is checked. It is not a rejection, it is a delay, and it lands in the week you least want one.
- The model year in positions 11 and 12 is a separate field from the certification date, and underwriters rate on the hull's age. A hull certified in September that carries the next model year is normal, and a document that copies one into the other creates a discrepancy that has to be unwound.
- Age drives survey conditions rather than price alone. Past a certain age a survey stops being a question and becomes a condition of cover.
- A boat with no HIN at all is straightforward if it predates 1 November 1972 and is a real problem if it does not.
Where an age threshold turns into a survey requirement is set out in yacht survey requirements for insurance, and what a seller has to record on the transfer document is on the boat bill of sale generator. What the model year then does to the figure you insure for is worked through on the agreed value check.
The five checks a HIN makes possible
None of these needs a paid report, and all five can be done before you pay a deposit.
- 1Read the transom HIN yourself rather than accepting a photograph, and find the hidden second one. They must be identical.
- 2Match those 12 characters against the bill of sale, the title or documentation, and the registration. Any single mismatch is worth stopping for.
- 3Resolve the MIC on the Coast Guard search and check the builder is who the seller says it is.
- 4Check the model year in positions 11 and 12 against what the listing advertises. Listings routinely round it in the seller's favour.
- 5Book the survey. It is the only one of these five that finds what the paperwork cannot, and it is the one buyers skip.
Bought the boat?
Send the vessel details and the agreed value you want written. Quote terms come back within 24 hours, and cover can be in place before delivery.
This tool decodes a published format and links to public records. It is information, not financial or legal advice, and it is not a title search, a survey or a guarantee of a boat's history.
Frequently asked questions
Is there a free boat history report?+
There is no boat equivalent of a vehicle history report, free or paid. No federal register of recreational-boat accidents, liens or salvage exists. The sites selling one aggregate partial state and salvage feeds and do not publish what they cover, so a clean result means only that nothing appeared in whatever they happened to search.
Can you look up a boat by HIN?+
You can decode it, and you can check it against a handful of public records. The Coast Guard MIC search resolves the builder code, and the PSIX search takes a HIN but covers documented and commercial vessels rather than typical recreational boats. Title, lien and salvage records sit with individual states.
What do the 12 characters of a HIN mean?+
Positions 1 to 3 are the builder's manufacturer identification code, 4 to 8 the hull serial, 9 to 10 the month and year the hull was certified, and 11 to 12 the model year. The last two are a separate field from the certification date and legitimately differ.
Why does my boat have no HIN?+
Boats built or imported before 1 November 1972 were never required to carry one, so its absence on an older hull is normal. Hulls from between 1972 and 31 July 1984 used earlier formats that will not parse under the current rule. A boat built after 1984 with no HIN is a genuine problem.
Is a HIN the same as a boat VIN?+
People search for boat VIN and mean the HIN. A car VIN is 17 characters and opens a commercial history file; a boat HIN is 12 and does not, because that file does not exist. A trailer is a separate vehicle with its own 17-character VIN, and the two get conflated constantly.
Does the model year in the HIN have to match the listing?+
It should, and it often does not. The model year is positions 11 and 12, and a listing that advertises a later year than the hull carries is worth questioning before you negotiate on it. Underwriters rate on the hull's age, so the discrepancy follows the boat into the insurance conversation.
Do European boats have a HIN?+
Recreational craft in the EU carry a Craft Identification Number under the Recreational Craft Directive, built on the same idea with a different layout that includes a country code. This decoder is written for the 12-character US format and will not parse a CIN correctly.
Does the HIN affect what my boat insurance costs?+
Indirectly. The HIN itself is an identifier, but the model year inside it feeds the hull's age, and age drives both the rate and whether a survey becomes a condition of cover. The premium band on the cover we introduce to runs 1% to 1.5% of the agreed value.
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