The structure of ID number is as follows:
1. Before 1 and 2 digits indicate the code of the province. The province code of Chongqing is 5 1, which was changed to 50 after being directly under the central government.
2. The third and fourth digits indicate the code of the city; The area code of Chongqing is 02.
3. The 5th and 6th digits represent the code 38 of Wuxi County.
4. The number 7- 14 indicates the date of birth.
5. The numbers 15, 16 and 17 indicate the serial codes compiled for people born in the same year and month in the same address code.
6. Bit 17 has the function of gender recognition, with odd numbers for men and even numbers for women.
7. Bit 18 is the check code, which is calculated by the numbering unit according to the unified formula. If the suffix is 10, use X instead. ..
Please note that an individual's ID number is unique and there is no such thing as the last four digits. If you need more information about the ID card, it is recommended to consult the relevant departments.