Citizenship number is a characteristic combination code, which consists of 17 bit ontology code and check code. The order from left to right is: six-digit address code, eight digits.

Word date of birth code, three-digit serial code and one-digit check code.

2. Address code

The administrative division code of the county (city, flag, district) where the permanent residence of the coding object is located shall be implemented according to GB/T2260.

3. Date of birth code

Indicates the year, month and day when the coded object was born, which is implemented according to GB/T7408. There is no separator between the year, month and day codes.

4, serial code

It means that in the area identified by the same address code, serial numbers are assigned to people born on the same day of the same year, odd numbers are assigned to men, and even numbers are assigned.

For women.

5. Check code