3 fortune tellers after ID card _ 3 fortune tellers after ID card

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

The first six digits are administrative division codes; The 7th digit is the date of birth code; 15 to 17 are sequential codes. In the sequential code, if the odd number is 17, it means male and the even number means female. 18 bits are check codes. As the check code of the suffix, if it is 0 ~ 9, X will not appear, but if the suffix is 10, then X must be used instead. I wish you happiness.