Fortune-telling ID number suffix with x_ ID suffix X fate

What does the letter X on the ID card mean?

The letter X on the ID card indicates that the last verification code of the ID card is Roman numeral 10, and the letter X is used instead.

As the tail number, the check code is calculated by the numbering unit according to a unified formula. If someone's suffix is 0-9, X will not appear, but if the suffix is 10, then X will be used instead.

Because if you use 10 as the ending number, then this person's ID card becomes 19, and the number of 19 violates the national standard, and the computer application system in our country does not recognize the ID card number of 19. X is the Roman numeral 10. Replacing 10 with X can ensure that the citizen ID card meets the national standards.

Extended data:

Calculation method of the last check code of ID card

1. Multiply the digits of the previous ID number 17 by different coefficients respectively. The coefficients from the first place to the seventeenth place are: 7-9-10-5-8-4-2-1-6-3-7-9-10-5-8-4-2.

2. Add the multiplication results of this 17 digit and the coefficient.

3. Divide the added sum by 1 1 to see what the remainder is.

4. The remainder can only be11-2-3-4-5-6-7-8-9-10. The number corresponding to the last ID card is 1-0-X-9-8-7-6-5-4-3-2. (that is, the remainder 0 corresponds to 1, the remainder 1 corresponds to 0, and the remainder 2 corresponds to x ...)

5. As can be seen from the above, if the remainder is 3, 9 will appear in the18th digit of the ID card. If the corresponding number is 2, the last digit of the ID card is the Roman numeral X. ..

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