When a Chinese national presents their identity card during account opening, employment registration or business onboarding, one of the first things a Malaysian organisation may look at is the identification number.
Unlike some identification systems, China's Resident Identity Card number follows a structured 18-character format. Each part of the number has a specific meaning. It contains information relating to the person's registered administrative area, date of birth and a sequence code, followed by a check digit.
Understanding this format can be useful for banks, compliance teams, employers and businesses that regularly deal with Chinese nationals.
An identification number that follows the correct format does not automatically mean the identity card is genuine or that the person presenting it is its rightful holder.
Let's look at what these 18 digits actually tell us.
Understanding the 18-Digit Chinese ID Card Number Format
China's Resident Identity Card number, officially known as the Citizen Identity Number (公民身份号码), follows the national standard GB 11643-1999.
The standard divides the 18-digit number into four sections. Each section serves a different purpose.
The First 6 Digits: Administrative Region Code
The first six digits identify the administrative area associated with the person's registered permanent residence.
This code follows China's administrative division system and identifies the relevant county, county-level city, banner or district.
For example, different administrative areas in Beijing, Shanghai, Guangdong and other provinces have their own corresponding codes.
It is worth understanding that this section does not necessarily tell you where the person currently lives. Someone whose household registration is associated with an area in Shanghai may now be living and working in Shenzhen, Guangzhou or even Malaysia.
For businesses conducting identity checks, the administrative region code provides useful background information, but it should not be treated as proof of the person's current residential address.
Digits 7–14: Date of Birth
The next eight digits represent the person's date of birth in YYYYMMDD format. This is probably the easiest section to understand. For example:
When reviewing a Chinese ID number, this section can be used to check whether the date of birth is a valid calendar date.
It can also be compared against the date of birth declared by the individual during onboarding. If the date of birth on the identification document does not match the information provided in the application, the discrepancy should be investigated.
However, a matching date of birth alone does not establish that the identification number belongs to the person being onboarded.
Digits 15–17: Sequence Number
The next three digits form the sequence number. This number is assigned to distinguish individuals who share the same administrative region code and date of birth.
There is also another detail worth knowing. Under the numbering rules, an odd number in the final position of this three-digit section is assigned to males, while an even number is assigned to females. For example:
This is part of China's identification numbering convention.
While this information can help someone understand the structure of a Chinese identity number, it should not be used as a standalone method of establishing an individual's identity.
The 18th Digit: The Check Digit
The final character is the check digit. It is used to check whether the preceding 17 digits have been entered or transcribed correctly.
Unlike the first 17 characters, the last character is calculated using a mathematical formula under the GB 11643-1999 standard, based on the preceding digits.
One detail that sometimes confuses people is the letter X appearing at the end of a Chinese ID number.
The check digit can be represented by a number from 0 to 9 or the letter X. In this context, X represents the value 10 in the check-digit calculation.
So, if you come across a Chinese ID number ending in X, there is no reason to assume that it is invalid simply because it contains a letter.
In fact, X is a recognised part of the Chinese identity number format.
Can You Verify a Chinese ID Number Just by Checking Its Format?
This is where things become particularly important for organisations handling customer onboarding and identity verification.
A Chinese ID number can be checked for several basic characteristics. These checks are useful. They can identify obvious formatting mistakes, incorrectly entered numbers and some invalid identification numbers.
- Whether it contains the expected 18 characters.
- Whether the first six digits follow a recognised administrative code format.
- Whether the date of birth section represents a valid date.
- Whether the sequence number follows the expected structure.
- Whether the final check digit is mathematically correct.
- Whether the identification number was genuinely issued to that individual.
- Whether the personal information matches the official identity record.
- Whether the identification document presented is genuine.
- Whether the person submitting the document is actually the individual associated with that identity.
However, they have one major limitation. A number can pass all these checks without being genuine or belonging to the person presenting it.
Think about it this way. Someone could provide an identification number that has the correct number of characters, a valid date of birth and a mathematically correct check digit. From a formatting perspective, everything may appear correct.
This is the difference between checking an identification number and verifying an identity.
For Malaysian banks, financial institutions, fintech companies and other organisations, the distinction matters.
What Malaysian Businesses Should Take Away
Malaysia has a growing number of business relationships involving Chinese nationals, whether through employment, financial services, company registration, investment or commercial transactions.
For organisations dealing with Chinese customers or business partners, understanding the Chinese ID card number format is a useful starting point.
It helps onboarding teams recognise the structure of the document, understand the information encoded in the number and identify basic inconsistencies.
However, businesses should be careful not to treat a successful format check as completed identity verification.
There is a meaningful difference between an identification number that looks valid and an identity that has been verified against authoritative information.
For organisations where identity accuracy is important, that distinction should form part of the onboarding process.
Need to Verify a Chinese National's Identity in Malaysia?
ChinaKYC.my provides information and practical guidance on verifying Chinese nationals and Chinese businesses in Malaysia.
For organisations that require more than basic document and identification number checks, Info Data provides China-focused identity verification services, including authoritative identity information checks, facial verification, mobile number verification, bank card verification, fraud checks and litigation checks.
The objective is straightforward: help Malaysian organisations go beyond checking what appears on an identification document and establish a stronger basis for identity verification.
Reference
- [1]GB 11643-1999 – Citizen Identification Number, People's Republic of China National Standard.
- [2]Beijing Municipal Public Security Bureau – Explanation of the 18-digit Citizen Identity Number structure.