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Interactive ISO 3779 Architecture

VIN Number Meaning & Character Breakdown

Explore the exact structural meaning of all 17 characters in a modern vehicle identification number.

Character count: 17/17

VIN Structure Breakdown

Hover or tap any segment to explore its ISO 3779 specification

Select or hover over any character above to inspect its regulatory role and meaning.

World Manufacturer Identifier (WMI)Chars 1–3
Current sample value: 1HG

Identifies the vehicle manufacturer, country of origin, and vehicle category.

Vehicle Descriptor Section (VDS)Chars 4–8
Current sample value: CV1F3

Describes vehicle attributes: model, body style, engine type, transmission, and restraint system.

Security Check Digit (Check Digit)Char 9
Current sample value: 7

Mathematical verification digit based on standard weights and modulo-11 algorithm.

Model Year Code (Model Year)Char 10
Current sample value: L

Standardized 30-year rotating code denoting vehicle model year.

Assembly Plant Code (Plant Code)Char 11
Current sample value: A

Manufacturer-specific internal factory/assembly plant code where the vehicle was built.

Vehicle Identifier Section / Serial (VIS / Serial)Chars 12–17
Current sample value: 012345

Sequential production number identifying the individual vehicle off the assembly line.

The Anatomy of an Automobile's Biometric Fingerprint

Before 1981, automotive manufacturers created proprietary serial numbering conventions that varied wildly in length and format. Ford used 11 characters, General Motors used 13, and Chrysler utilized 13. The adoption of federal standard 49 CFR Part 565 and international standard ISO 3779 created the unified 17-character VIN standard still in force today.

Why Position 9 Holds Special Legal Significance

In the United States and Canada, position 9 is strictly reserved for the mathematical security check digit. Automakers cannot use this character for trim or paint options. The check digit allows law enforcement and state titling agencies to authenticate registration certificates against forged VIN stampings on stolen vehicles.

Frequently Asked Questions

Under ISO 3779, a VIN is divided into three core sections: the World Manufacturer Identifier (WMI - characters 1–3), the Vehicle Descriptor Section (VDS - characters 4–8), and the Vehicle Identifier Section (VIS - characters 9–17, which includes the check digit, model year, plant code, and sequential serial number).

Related Free VIN Utilities

Explore companion tools running client-side in your browser

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VIN Decoder

Decode full vehicle build specifications, engine details, and assembly plant.

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VIN Validator

Verify 17-character structure, ISO 3779 validity, and checksum integrity.

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Check Digit Calculator

Step-by-step mathematical breakdown of the 9th position checksum.

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VIN Recall Check

Search official NHTSA safety defect recalls and free manufacturer remedies.

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