The old ID card is 15 digits, and the new ID card is 18 digits. The first five digits are the area code, followed by the date of birth, and the last four digits are probably the number of local people born on the same day. It stands to reason that people will have a corresponding ID number when they are born. Why are there only eight digits?

For example: 21080285110123.

The first two digits of the ID card are the province number, such as 2 1 Liaoning Province.

The 3-digit and 4-digit numbers are the city number 08 Jinzhou City.

5 and 6 are county numbers, and 02 is Linghe District.

The number 7- 12 is the number 85 of the date of birth. See 1 65438+1October1.

13- 14 The number of the police station is 12.

15 Men with gender numbers are single and women are even.