HIN Lookup — Decode Any Boat's Hull Number
A boat's Hull Identification Number is its VIN. Enter the 12-character HIN from the transom to break out the manufacturer code, hull serial, and build year instantly. The marine equivalent of a VIN decode — free, no sign-up.
Enter the 12-character HIN from the transom — we'll break out the manufacturer code, serial, and build date.
HIN vs “Boat VIN” — Same Idea, Different Code
Searchers ask for a “boat VIN” every day. Boats don't carry the 17-character automotive VIN — they carry a 12-character Hull Identification Number (HIN) that does the exact same job: a permanent, unique identity used for titling, registration, recalls, and theft records.
12 characters · on the transom
- ·Required by the US Coast Guard since Nov 1, 1972.
- ·MIC + hull serial + build-date characters.
- ·Used to title, register, and trace any boat or PWC.
17 characters · on the dash & door
- ·Vehicle Identification Number for cars and trucks.
- ·Same purpose — permanent, unique identity.
- ·Your boat trailer has a 17-character VIN, not a HIN.
Quick test: count the characters. Exactly 12means it's a boat HIN and the decoder above will read it. If it's 17, you're looking at the VIN on the boat trailer or tow vehicle — use the VIN lookup instead.
How to Look Up a Boat by Its HIN — Step by Step
Five steps from “where is it?” to a full hull identification. Works for powerboats, sailboats, and personal watercraft with a standard 12-character HIN.
Find the HIN on the transom
The primary HIN is on the upper starboard (right) corner of the transom — the flat rear of the boat — within two inches of the top. A duplicate is hidden elsewhere on the hull, and the same number is on the registration and title.
Read all 12 characters
A standard HIN is exactly 12 characters: a 3-character manufacturer code, a 5-character hull serial, and a 4-character date section. Copy it precisely — a single wrong character points to a different hull.
Decode it instantly
Enter the HIN above. The decoder isolates the Manufacturer Identification Code (MIC), the hull serial number, and translates the date characters into a build month and model year — free, in seconds.
Match it to the paperwork
Confirm the decoded HIN matches the registration, the title, and the hidden duplicate HIN on the hull. Any mismatch between copies is an immediate red flag for a re-numbered or stolen boat.
Run a history & theft check
With the HIN verified, check title brands, recalls, and theft records through your state titling agency and the US Coast Guard before money changes hands.
What Each Part of a HIN Means
A 12-character HIN isn't random — it's a structured code. Knowing the segments tells you exactly what the decoder is reading.
| Position | Segment | What it tells you |
|---|---|---|
1–3 | MIC | Manufacturer Identification Code — three characters the US Coast Guard assigns to each boat builder. This is how the tool knows who built the hull. |
4–8 | Hull serial | A five-character serial number the manufacturer assigns to that specific hull. Unique within the builder's production run. |
9 | Month (current format) | In the straight-year format, the month of build encoded as a letter A–L (A = January through L = December). |
10 | Year digit | A single digit for the year the hull was built/certified in the straight-year format. |
11–12 | Model year | The two-digit model year of the boat. In the older model-year format these positions shift — the 11th character is the letter 'M' and the 12th is the month. |
The Two HIN Date Formats
The last four characters encode the date two different ways depending on when the boat was built. Our decoder detects the format automatically — here's how to read each by hand.
| Format | Used | Date Layout | Example |
|---|---|---|---|
| Straight-Year Format | Aug 1, 1984 → present | MIC · serial · month(A–L) · year-digit · model-year | ABC12345 H8 05 |
| Model-Year Format | Nov 1972 → Jul 1984 | MIC · serial · model-year · 'M' · month(A–L) | ABC12345 79 M H |
Month letters run A–L for January through December in both formats.
Decode Your Boat's HIN in Seconds
Free, instant hull identification — manufacturer code, serial, and build year straight from the 12-character HIN.
Enter the 12-character HIN from the transom — we'll break out the manufacturer code, serial, and build date.
Always Match the HIN Before You Buy a Boat
The HIN is a boat's permanent identity, so it's the single best defence against buying a stolen or re-titled hull. A re-numbered boat wears the identity of a legitimate vessel to hide a theft or total-loss history — and the way to catch it is to decode the HIN and confirm every copy matches.
Decode the number first to confirm the manufacturer and build year line up with the listing. Then verify the same HIN appears identically on the transom, the hidden duplicate on the hull, the registration, and the title.
When the identity checks out, take the HIN to your state titling agency and the US Coast Guard to confirm title status, recalls, and theft records before any money changes hands.
HIN red flags
- Decoded manufacturer or year doesn't match the listing
- Transom HIN differs from the hidden duplicate on the hull
- HIN on the boat doesn't match the title or registration
- Plate or stamping looks ground down, re-glued, or repainted
- Fewer or more than 12 characters on a post-1972 boat
- Seller can't or won't show you the transom HIN
Trailer or Tow Vehicle? Decode Its VIN Too
Your boat has a HIN — but the trailer and the truck towing it carry 17-character VINs. These tools cover the rest of the rig.
Always check the VIN before you buy
Our free report reveals accidents, title brands, odometer rollback, theft records, and open recalls in seconds.
HIN Lookup — Frequently Asked Questions
Direct answers to what boat buyers and owners ask most.
What is a HIN on a boat?+
A HIN, or Hull Identification Number, is a 12-character code that uniquely identifies a boat — the marine equivalent of a car's VIN. The US Coast Guard has required a HIN on every boat manufactured or imported for sale in the United States since November 1, 1972. It encodes the manufacturer, a unique hull serial number, and the build date.
Is a HIN the same as a boat VIN?+
Effectively yes. People search for a 'boat VIN,' but boats don't use the 17-character automotive VIN — they use a 12-character HIN that serves the same purpose: a permanent, unique identifier used for registration, titling, recall, and theft records. If someone refers to a boat's VIN, they mean its HIN.
Where is the HIN located on a boat?+
The primary HIN is permanently affixed to the upper starboard (right) side of the transom — the flat rear of the boat — within two inches of the top. A duplicate HIN is also hidden in an unexposed location elsewhere on the hull. On a PWC or jet ski it's typically on the rear or the hull near the pump. It's also listed on the registration and title documents.
How do I read a 12-character HIN?+
The first three characters are the Manufacturer Identification Code (MIC). Characters 4–8 are the hull serial number assigned by the builder. The final four characters encode the date. In the current straight-year format the 9th character is the month of build (A–L for January–December), the 10th is a year-of-build digit, and the 11th–12th are the model year.
What do the letters in a HIN date mean?+
In the build-date portion, months are encoded as letters A through L: A is January, B is February, and so on through L for December. So a HIN with 'H' in the month position was built in August. Our decoder translates the letter automatically.
Can I find the boat manufacturer from the HIN?+
Yes — the first three characters are the Manufacturer Identification Code (MIC), which the US Coast Guard assigns to each builder. Our tool isolates the MIC for you; to convert it to a company name, look it up in the official USCG MIC database, which we link directly from the result.
Why is my HIN not 12 characters?+
Boats built before November 1, 1972 predate the federal HIN requirement and may have no HIN or a non-standard builder's number. Some imported or home-built boats also carry irregular numbers. A standard, decodable HIN is always exactly 12 characters; anything shorter or longer needs to be verified with the manufacturer or your state titling agency.
Does a HIN lookup show the boat's owner?+
No. Owner identity is personal information protected by privacy law and is not returned by a HIN decode. What the HIN gives you is the boat's identity — manufacturer, serial, and build year — plus a starting point for registration, recall, and theft checks through the relevant marine authorities.
Can I check a boat's history with the HIN?+
The HIN is the key used to look up a boat's title, registration, accident, and theft history through state agencies and the US Coast Guard. Decoding the HIN confirms the boat's identity and build year first; from there you can verify the same number matches the title and run a marine history report before buying.
Does a jet ski or PWC have a HIN?+
Yes. Personal watercraft (jet skis, wave runners) follow the same US Coast Guard HIN rules as any other boat — a 12-character Hull Identification Number, usually on the rear of the hull. Our decoder reads a PWC HIN exactly the same way it reads a boat HIN.
Decode Any Boat by Its Hull Number
Enter a 12-character HIN to identify the manufacturer, hull serial, and build year — the marine equivalent of a free VIN decode.
Enter the 12-character HIN from the transom — we'll break out the manufacturer code, serial, and build date.
Related VIN Checks
More tools to verify any vehicle's history