Cn Id Validator

cn id validator

Chinese ID Validator

Validate Chinese ID numbers (18-digit and 15-digit formats) and extract information.

Features

• Validate 18-digit ID numbers (with checksum verification)
• Validate 15-digit ID numbers (with birth date check)
• Extract birth date from ID number
• Extract gender from ID number
• Extract region code from ID number
• Pure Python, no external dependencies

ID Number Format

18-digit Format (1999-present)

• 1-6: Region code
• 7-14: Birth date (YYYYMMDD)
• 15-17: Sequential code (odd=male, even=female)
• 18: Check digit (0-10, where 10=X)

15-digit Format (1985-1999)

• 1-6: Region code
• 7-12: Birth date (YYMMDD, assumed 19xx)
• 13-15: Sequential code (odd=male, even=female)

Usage

python3 scripts/id_validator.py --id 110101199003074416

Example Output

{
  "valid": true,
  "region": "110101",
  "birthday": "1990-03-07",
  "gender": "男"
}

Validation Rules

1. Length must be 15 or 18 digits
2. Birth date must be a valid calendar date
3. For 18-digit IDs: checksum must be correct
4. Region code must be a valid Chinese administrative region

Common Region Codes

Code	Region
110000	北京市
310000	上海市
440000	广东省
320000	江苏省
330000	浙江省

Use Cases

• User registration form validation
• Identity verification in business processes
• Age-based access control
• Demographic data analysis

Notes

• This tool validates format and checksum only
• It does not verify against government databases
• Region codes are not fully validated (only format checked)
• Results are for reference only

Technical Details

• Language: Python 3
• Dependencies: None (standard library only)
• License: MIT-0