Why does PlayerUnknown's Battlegrounds always prompt that the ID number is incorrect when verifying it with an ID card?

The last digit of the ID number is entered incorrectly. If the last digit of the ID number is the verification code X, you should enter a capital X instead of a lowercase x. The capital X is the ID card The Roman numeral X in the number.

After China’s resident ID cards were upgraded, some people’s ending numbers became During exams and other processes, the examiner often does not understand it and thinks it is a fake ID card. Such misunderstandings bring inconvenience to many people's lives.

As the check code for the tail number, it is calculated by the number compilation unit according to a unified formula. If someone's tail number is 0-9, X will not appear, but if the tail number is 10, then you have to replace it with 19-digit ID number.

Extended information:

Structure and form of ID number

1. Number structure

Citizen ID number is a characteristic combination code. It consists of a seventeen-digit body code and a check code. The order from left to right is: six-digit address code, eight-digit date of birth code, three-digit sequence code and one-digit check code.

2. Address code

Indicates the administrative division code of the county (county-level city, banner, district) where the coding object’s permanent residence is located, and shall be implemented in accordance with the provisions of GB/T2260.

3. Date of birth code

Indicates the year, month, and day of the encoding object's birth. It is implemented in accordance with the provisions of GB/T7408. There is no separator between the year, month, and day codes.

4. Sequence code

Indicates the sequence number assigned to people born in the same year, same month, and same day within the area identified by the same address code, and the odd distribution of the sequence code to men, and even numbers to women.

5. Check code

The check code is calculated based on the previous seventeen-digit code and the ISO 7064:1983.MOD 11-2 check code.

Reference: Baidu Encyclopedia-ID Card Number