How is a Vietnamese CCCD structured?

It has 12 digits: positions 1 to 3 are the province or city code of registration, position 4 encodes century and gender, positions 5 to 6 are the last two digits of the birth year, and positions 7 to 12 are a random sequence number.

Does the CCCD have a check digit?

No. Unlike many tax IDs, the 12-digit CCCD has no mathematical check digit. Validation therefore confirms structure — a recognised province code and a decodable century or gender digit yielding a plausible birth year.

What does the fourth digit mean?

The fourth digit combines century and gender: 0 and 1 mean male and female born in the 1900s, 2 and 3 mean the 2000s, 4 and 5 the 2100s, and so on. Even digits are male, odd digits are female.

Can this confirm the card is genuine?

No. A consistent structure does not prove the card exists or belongs to a real person. For KYC, verify against the official identity database; this tool only checks the encoded format.

Is my ID number sent anywhere?

No. All decoding runs in your browser, so the CCCD never leaves your device.

Vietnam Citizen ID (CCCD) Validator

The Vietnamese Citizen Identification Card number (Căn cước công dân, CCCD) is the 12-digit identifier that replaced the older 9-digit CMND. Unlike a tax code, it carries no arithmetic check digit; instead, each field has a fixed meaning, so the number itself encodes the holder’s province of registration, gender, century of birth and birth year. This free validator decodes those fields and flags structural inconsistencies — useful for banking KYC, labour onboarding and form validation.

How it works

The 12 digits break down into four fields:

Positions 1-3 — province or city code of registration (for example 079 is Hồ Chí Minh City, 001 is Hà Nội).
Position 4 — a combined century and gender digit. Even digits (0, 2, 4, …) are male and odd digits (1, 3, 5, …) are female; each pair steps the century forward by 100 years starting from the 1900s.
Positions 5-6 — the last two digits of the birth year, combined with the century from position 4.
Positions 7-12 — a random sequence number that distinguishes people who share the earlier fields.

The validator marks a number as inconsistent if the province code is unrecognised or the decoded birth year lands in the future.

Example

For a CCCD beginning 079 2 95 ...: province 079 is Hồ Chí Minh City, the digit 2 means male born in the 2000s, and 95 combined with that century gives a birth year of 2095 — which would be flagged as future-dated. A digit 0 with 95 would instead decode to 1995, a plausible year.

Because there is no check digit, a consistent structure does not prove the card is genuine. For real identity verification, check the official database. Everything here runs locally — your ID number never leaves your device.