Israeli ID Validator

Step 1: Identify ID Type

Step 2: Validate Using Check Digit Algorithm

The Israeli ID check digit algorithm (applies to all types):

def validate_israeli_id(id_number: str) -> bool:
    """Validate Israeli ID number (TZ, company, amuta, etc.)"""
    # Remove dashes and spaces, pad to 9 digits
    id_str = id_number.replace('-', '').replace(' ', '').zfill(9)

    if len(id_str) != 9 or not id_str.isdigit():
        return False

    total = 0
    for i, digit in enumerate(id_str):
        val = int(digit) * ((i % 2) + 1)  # Multiply by 1 or 2 alternately
        if val > 9:
            val = val // 10 + val % 10     # Sum digits if > 9
        total += val

    return total % 10 == 0

Step 3: Provide Result

For valid IDs: Confirm valid, identify type by prefix For invalid IDs: Report invalid, show which check failed, suggest common errors:

• Transposed digits
• Missing/extra digit
• Incorrect check digit

Step 4: Generate Test IDs (Development Use)

For development and testing, generate valid test IDs:

def generate_test_id(prefix: str = "") -> str:
    """Generate a valid Israeli ID number for testing."""
    import random
    base = prefix + ''.join([str(random.randint(0, 9)) for _ in range(8 - len(prefix))])
    # Calculate check digit
    total = 0
    for i, digit in enumerate(base):
        val = int(digit) * ((i % 2) + 1)
        if val > 9:
            val = val // 10 + val % 10
        total += val
    check = (10 - (total % 10)) % 10
    return base + str(check)

CAVEAT: Generated IDs are for testing only. Never use random IDs as real identification.

Example 1: Validate TZ

User says: "Is 123456782 a valid Israeli ID?" Result: Run algorithm, report valid/invalid with explanation.

Example 2: Code Implementation

User says: "I need Israeli ID validation in JavaScript" Result: Provide equivalent algorithm in JavaScript.

Example 3: Generate Test Data

User says: "I need 10 valid test company numbers" Result: Generate 10 valid IDs with 51- prefix for testing.

Scripts

• scripts/validate_id.py — Validates, identifies, formats, and generates Israeli ID numbers (Teudat Zehut, company, amuta, partnership). Supports verbose mode showing step-by-step check digit calculation, batch test ID generation with prefix control, and type identification from any ID number. Run: python scripts/validate_id.py --help

References

• references/id-formats.md — Specification of all Israeli ID number formats including Teudat Zehut, company (51-prefix), amuta (58-prefix), partnership (55-prefix), and cooperative society (57-prefix) with issuing authorities, format patterns, the Luhn-variant check digit algorithm with a worked example, and common validation errors. Consult when implementing validation logic or debugging check digit failures.

Error: "ID appears valid but isn't recognized"

Cause: Check digit passes but the ID isn't issued Solution: The algorithm only validates FORMAT, not existence. Verifying if an ID is actually issued requires Tax Authority or Interior Ministry systems.