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.

1, address code

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.

2. 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.

3. Sequence code

It refers to the serial number of people born in the same year, month and day in the area identified by the same address code. Odd numbers of serial numbers are assigned to men and even numbers to women.

4. Check code

According to the previous 17 bit code, the check code is calculated according to the check code of ISO 7064: 1983. MOD 1 1-2。

The address code of Guangdong Province is 440000.

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.

So the ID card of Guangdong Province starts with 44.

Extended data:

Citizens who need to prove their identity when handling the following matters may show their resident identity cards:

(1) Voter registration;

(2) household registration;

(3) military service registration;

(4) marriage registration;

(5) Admission and employment;

(6) Handling notarization affairs;

(seven) to the border management area;

(8) Going through exit formalities;

(nine) to participate in litigation activities;

(ten) for motor vehicle and ship driving license and non motor vehicle license;

(eleven) for individual business license;

(12) Handling personal credit affairs;

(thirteen) to participate in social insurance and receive social relief;

(fourteen) to go through the formalities of taking a civil aviation plane;

(fifteen) to go through the registration formalities of accommodation hotels;

(sixteen) to withdraw remittances and mail;

(17) Consigned goods;

(eighteen) to handle other affairs.

(nineteen) by train

No unit or individual may seize a citizen's identity card or use it as collateral, except that the public security organ may take compulsory measures against the defendant according to law.

Baidu Encyclopedia-Resident ID Number