The first six digits of the ID card are the address code, which indicates the administrative division code of the location.
The seventh to fourteenth digits are birth date codes, arranged in chronological order.
15 and 16 are serial numbers, which are compiled for people born in the same year, month and day in the same area.
The number 17 is the gender identification code, which is singular for men and even women.
The bit 18 is the check code, which is randomly generated and arranged according to 1~ 10. The first nine digits are displayed in Arabic numerals, and 10 is replaced by the Roman letter X. ..