The suffix of the ID card is the letter X. Please fill in the capital letter X, and don't use lowercase format. If you fill in and save in lowercase letters, you will be prompted that the ID number is incorrect.
The suffix of the ID card is the letter X, and the check code as the suffix is obtained by the number compiling unit according to the unified formula. X is Roman numeral 10. Replacing 10 with X can ensure that citizens' ID cards meet the national standards.
Legal basis: People's Republic of China (PRC) National Standard (GB11643-1999) issued by China State Bureau of Quality and Technical Supervision stipulates the citizenship number. Citizenship number is a characteristic combination code, which consists of 17 bit ontology code and 1 bit check code.
From 1999 65438+ 10/0, the national ID card number system was implemented, and the number of resident ID cards was increased from 1 5 to 18. The first 6 digits are the address code; The seventh digit to 14 is the birth date code, which is changed from 6 digits to 8 digits, in which the year is represented by 4 digits; 15 to 17 are sequence codes, and the specific numbers used for centenarians in the sequence codes are cancelled; The 18 bit is a check code, which is mainly used to check whether the first 17 bits of the citizen ID number input by the computer are correct. Its value range is 0 to 10, and when the value is equal to 10, it is represented by the Roman numeral symbol X. ..