What Is a VIN? Vehicle Identification Number Explained

A VIN — Vehicle Identification Number — is a unique 17-character code stamped on every road vehicle built since 1981. Think of it as the vehicle’s fingerprint: no two vehicles share one, and it stays with the car for life, through every owner, province, and repair. That permanence is what makes the VIN so useful. It’s the key that unlocks recalls, safety ratings, registration, insurance, and full history records for one specific vehicle — which is why it’s the first thing to ask for when buying used.

What the VIN is made of

The 17 characters aren’t random. They break into three sections that encode the manufacturer and region, the vehicle’s attributes (model, body, engine), and a unique serial number, plus a model-year code and a check digit that proves the number is genuine. If you want the character-by- character breakdown, see how to read a VIN. One quick rule: a VIN never contains the letters I, O, or Q.

Where to find the VIN

Through the base of the windshield on the driver’s side, readable from outside the car.
On a sticker or plate inside the driver’s door jamb.
On the vehicle registration, insurance slip, and title.

These should all read identically. When you’re buying, checking that they match — and that no VIN plate looks tampered with — is a simple, powerful safeguard.

VIN vs. licence plate

People sometimes assume a licence plate can be “looked up” like a VIN. It can’t — at least not by the public. A plate is tied to a registration and can change hands or be reissued, and in Alberta plate and registration data are privacy-protected, with no legal public plate-to-owner search. The VIN, by contrast, is tied to the vehicle permanently and is exactly what you use to check recalls, history, and safety. If a listing only shows a plate, ask for the VIN. See our license plate lookup explainer for why.

Why the VIN matters when buying used

Every meaningful pre-purchase check starts with the VIN: open recalls, crash-test ratings, a lien search, and a full history report all key off it. A seller who’s reluctant to share the full 17-character VIN before you meet is a small but real warning sign. A straightforward seller will hand it over without hesitation.

Try it

Have a VIN? Run it through the free VIN decoder to see the vehicle details, recalls, and safety ratings in seconds.

Last reviewed: January 2026

Frequently asked questions

What is a VIN?+

A VIN, or Vehicle Identification Number, is a unique 17-character code assigned to every vehicle manufactured since 1981. No two vehicles share a VIN, making it the key to recalls, history reports, registration, and insurance.

Where is the VIN located on a car?+

The VIN is visible through the base of the windshield on the driver’s side, on a sticker inside the driver’s door jamb, and printed on the vehicle registration and insurance documents.

How many characters are in a VIN?+

A modern VIN has exactly 17 characters, made up of digits and capital letters but never I, O, or Q, which are excluded to avoid confusion with 1 and 0.

What’s the difference between a VIN and a licence plate?+

A VIN is permanently tied to the vehicle for its entire life, while a licence plate is assigned to a registration and can change. You can’t legally look up an owner from a plate in Alberta, but the VIN unlocks recalls, history, and safety data.

Why do I need the VIN when buying a used car?+

The VIN is how you check recalls, safety ratings, liens, and full vehicle history for a specific car. A seller can and should share the VIN; it’s the starting point for every due-diligence check.

What is a VIN?