(the first six digits of the ID number) indicates the administrative division code of the county (city, town, district) where the permanent residence of the coding object is located. 1-2 codes of provinces, autonomous regions and municipalities directly under the central government; 3-4 digits of code of prefecture-level cities, leagues and autonomous prefectures; 5-6 county, county-level city and district codes.

Date of birth code: (digits 7 to 14 of the ID number) indicates the year, month and day when the coded object was born, where the year is represented by four digits, and there is no separator between the year, month and day.

Sequence code: (digits 15 to 17 of the ID number) the sequence number assigned to the person born in the same year, month and day in the area marked by the address code. Among them, the seventeenth odd number is for men and the even number is for women.

Resident ID number, according to the provisions of [People's Republic of China (PRC) and national standard GB11643-1999], is a characteristic combination code, which consists of seventeen-digit ontology code and one-digit 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. ?