What is a VIN and where to find it on your car

Author: Mariano · Last updated: October 12, 2026

The VIN (Vehicle Identification Number) is like a car’s serial number. The manufacturer assigns it and it is unique: each vehicle keeps the same VIN for its whole life, even if it changes owners, states or plates.

If you’re about to buy a used car, the VIN is the first thing to ask for. With it you can see exactly which vehicle it is (make, model, year, engine), review the recalls issued for that model, and find out whether it has been reported stolen.

What a VIN looks like

Since model year 1981, federal rules (49 CFR Part 565) require vehicles sold in the United States to have a 17-character VIN. For example:

1HGCM82633A004352

A few rules that help you spot mistakes:

It has exactly 17 letters and numbers, no spaces.
It never uses the letters I, O or Q (so they aren’t confused with 1 and 0).
The ninth character is a “check digit” calculated from the other 16. If someone copied a character wrong, the check digit most likely won’t match. Our checker warns you when that happens.

What each part means

Positions	What it tells you
1–3	Manufacturer and country (WMI). E.g. `1HG` = Honda built in the USA
4–8	Vehicle attributes: model, body, engine, restraint system
9	Check digit
10	Model year (e.g. `3` = 2003, `R` = 2024, `S` = 2025)
11	Assembly plant
12–17	Production serial number

You don’t need to read it by hand: paste it into a decoder, like NHTSA’s or ours, and you get all of that spelled out.

Where to find the VIN on the car

On the dashboard, driver’s side. Look from outside through the windshield, at the lower left corner. There’s a small metal plate with the number.
In the driver’s door frame. Open the door and look for the sticker on the door pillar or the edge of the door. That’s the manufacturer’s certification label, which also shows the build date.
Elsewhere on the vehicle. Many manufacturers also mark it on the engine, the frame or body parts, which helps detect swapped parts.

Where to find it in the paperwork

On the vehicle’s title.
On the registration.
On the insurance card or policy.
On service records from a shop or dealer.

The most important trick: they must all match

Before buying, compare the VIN on the dashboard, the door and the title. They must be identical, character by character. If any of them differs, if the dashboard plate looks tampered with, or if the door sticker is missing or torn off, stop: it could be a stolen car, one rebuilt from other cars’ parts, or one with a title that doesn’t belong to it.

What to do once you have the VIN

Decode it to confirm the car is what the ad says (year, trim, engine). It’s very common for an ad to say “V6” or “4x4” and for the VIN to show something else.
Review the recalls issued for that model and confirm on NHTSA whether that specific car has been repaired.
Check NICB VINCheck to see whether it’s reported stolen or as a total loss.
If you’re serious, consider a vehicle history report (accidents, titles, mileage), which is paid.

You can start now: paste the VIN in the checker below and check it for free.

Frequently asked questions

How many characters does a VIN have?

Since model year 1981, every vehicle sold in the US has a 17-character VIN made of letters and numbers.

Why doesn't a VIN use the letters I, O or Q?

So they aren't confused with the numbers 1 and 0. If you see something that looks like an O, it's almost certainly a zero.

Is the VIN the same as the license plate?

No. The plate changes when the car is registered in another state or by another owner. The VIN is permanent and identifies the vehicle for its whole life.