The ID number system of different countries varies, and usually contains information such as date of birth, area code, and check digit. The following are examples of ID numbers in some common countries and their generation rules (all fictitious examples, for illustrative purposes only)： --- ### **1. China (Resident ID card)** -**Format**: 18 digits, the first 6 digits are the area code, the middle 8 digits are the date of birth (YYYYMMDD), the last 3 digits are the sequence code (the last digit may be the check code or gender identification: odd male, even female), the last digit is the check code (0-9or X). -**Sample**: `11010519900307234X` -`110105': Chaoyang District, Beijing -`19900307`: Born on March 7, 1990 -`234`: sequence code (male) -'x`: Check code (Roman numeral 10) --- ### **2. United States (Social Security number, SSN)** -**Format**: `AAA-BB-CCCC`, the first 3 digits are the area code (related to the place of birth before 1972, now random), the middle 2 digits are the group number, and the last 4 digits are the sequence code. -**Sample**: `123-45-6789` -Note: The real SSN is not public. Samples usually use test numbers such as `123-45-6789` or `111-11-1111`. --- ### **3. Japan (My Number)** -**Format**: 12 digits, the first 11 digits are randomly assigned, and the last 1 digit is the check code. -**Sample**: `123456789012` (fictitious). --- ### **4. Germany (ID number/tax number)** -**format**： -**ID number**: Mixed 9-10 alphanumeric digits (such as 't220001293`). -**Tax ID**: 11 digits, including date of birth and regional information (such as `12 345 678 901`). -**Sample**: `L12345678` (sample ID card number). --- ### **5. United Kingdom (National Insurance Number, NINO)** -**Format **: `AB 12 34 56 C`, the first two letters, the middle 6 digits, and the last letter. -**Sample**: `QQ 12 34 56 A' (non-real number, format reference). --- ### **6. South Korea (Resident Registration number)** -**Format**: 13 digits, the first 6 digits are the date of birth (YYMMDD), and the last 7 digits contain gender, area code, and check digit. -**Sample**: `900101-1234567' (fictional sample, gender code `1` is male). --- ###**Important Notes**： 1. **Privacy protection**: The above are fictitious examples. The real ID number is sensitive information. Please do not disclose or abuse it. 2. **Verification rules**: Many countries use a verification code (such as the X of the last digit in China) to verify the validity of the number through an algorithm (such as modulo 11). 3. **Dynamic changes**: Some countries (such as the US SSN) have adjusted their generation rules to prevent the disclosure of personal information. For an in-depth understanding of the rules of a particular country, it is recommended to consult official government documents (such as the Chinese Public Security Bureau, the U.S. SSA, etc.).