What do the last four digits of the ID card represent? What do you mean by the last four digits of your ID card?

1, the last four digits of the ID card, namely 15 to 18, represent the local serial number of the ID card holder, where the odd number is male and the even number is female. (Note: bit 18 is the check code, which is mainly used to check whether the first 17 bits of the citizen ID number entered by the computer are correct. Its value range is 0 to 10. When the value is equal to 10, it is represented by the Roman numeral symbol x ...)

2. The digital coding rules of the address code in Chinese mainland resident ID number are: the first and second digits indicate the province (autonomous region, municipality directly under the Central Government and special administrative region) where they are located. The third and fourth representative cities (summary codes of prefecture-level cities, autonomous prefectures, leagues, municipalities directly under the Central Government, municipal districts and counties). Where 0 1-20 and 5 1-70 represent provinces and municipalities directly under the central government; 2 1-50 indicates regions (autonomous prefectures and leagues). The fifth and sixth representatives represent counties (municipal districts, county-level cities and banners). 0 1- 18 refers to the county-level cities under the jurisdiction of municipal districts or regions (autonomous prefectures and leagues); 2 1-80 stands for county (flag); 8 1-99 stands for county-level cities directly under the provincial government. The 7th to14th represents the birth year of the ID card holder. For example, the number on the ID card is 199008 18, and the year of birth is1August 998 18.