What do the last four digits of the ID card mean?

The last four digits of the ID card indicate:

15 and 16 stand for the local police station code, 17 stands for gender, and 18 stands for the verification code.

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

Fifteenth, sixteenth on behalf of the police station code determined by the police station where the identity card application; Seventeen represents gender, odd numbers represent men and even numbers represent women.

The bit 18 is the check code, which is calculated by the numbering unit according to the unified formula. If someone's suffix is 0-9, X will not appear, but if the suffix is 10, X will be used instead.

Extended data:

Analysis of resident identity card number

1, the first six address codes

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

The digital coding rules of the address code in the ID card number of Chinese mainland residents are as follows:

The first and second digits represent provinces (autonomous regions, municipalities directly under the Central Government and special administrative regions).

The third and fourth digits represent cities (summary codes of prefecture-level cities, autonomous prefectures, regions, leagues and municipalities directly under the Central Government). Where 0 1-20 and 5 1-70 represent prefecture-level cities; 2 1-50 indicates regions (autonomous prefectures and leagues).

The fifth and sixth representatives represent counties (districts, county-level cities and banners). 0 1- 18 refers to the prefecture-level cities, autonomous prefectures, regions and counties under the jurisdiction of the Union; 2 1-80 stands for county (flag); 8 1-99 stands for county-level administrative units directly under the provincial government.

2. The middle eight digits of the birth date 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.

The seventh to fourteenth digits of the ID number indicate the year, month and day when the coded object was born, in which the year is represented by four digits, and there is no separator between the year, month and day. For example:1981May 1 1 daily1981051.

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