This iban verification tool lets you validate iban number entries with comprehensive iban country specific validation and formatting checks. Use it as an iban checker to validate international bank account number formats across all 80+ countries that use the IBAN standard. It performs iban mod 97 verification using the iban checksum calculator to ensure mathematical correctness.

Whether you need a sepa iban checker for European payments, an iban validator for payment processing in your app, or a bulk iban validation tool for batch operations, this tool handles it all. Developers can integrate via the iban validator api rest endpoint or deploy as a batch iban validation microservice. The iban bic validation lookup identifies banks from IBAN structure, while the iban risk indicator checker flags high-risk jurisdictions. For on-premises needs, consider iban forge self hosted deployment. The iban issuer classification tool identifies bank and branch details, making it ideal for iban validation for fintech platforms requiring real time iban verification api capabilities.

• Supports all 80+ IBAN countries worldwide
• Country-specific length and format validation
• MOD-97 checksum verification
• Real-time validation and error reporting
• Banking industry compliance standards
• Bulk and batch validation for multiple IBANs
• BIC/SWIFT lookup integration

An IBAN consists of up to 34 alphanumeric characters with a specific structure that varies by country. Understanding this structure is crucial for proper validation and implementation.

IBAN Components:

Country Examples:

The IBAN validation process follows a standardized algorithm that ensures both structural and mathematical correctness of the account number.

Validation Steps:

1. Length Check: Verify the IBAN length matches the country's standard
2. Character Check: Ensure only valid alphanumeric characters are used
3. Country Code: Validate the first two letters against ISO 3166-1
4. Rearrangement: Move the first 4 characters to the end
5. Character Substitution: Replace letters with numbers (A=10, B=11, etc.)
6. MOD-97 Calculation: Calculate remainder when divided by 97
7. Result Verification: Valid IBAN should have remainder of 1

Implementation Example:

// IBAN Validation Algorithm
function validateIBAN(iban) {
  // Remove spaces and convert to uppercase
  const cleanIban = iban.replace(/\s/g, '').toUpperCase();

  // Check basic format
  if (!/^[A-Z]{2}[0-9]{2}[A-Z0-9]+$/.test(cleanIban)) {
    return false;
  }

  // Rearrange: move first 4 chars to end
  const rearranged = cleanIban.slice(4) + cleanIban.slice(0, 4);

  // Convert letters to numbers (A=10, B=11, etc.)
  const numericString = rearranged.replace(/[A-Z]/g, char =>
    (char.charCodeAt(0) - 55).toString()
  );

  // Calculate MOD-97
  return mod97(numericString) === 1;
}

// MOD-97 for large numbers (string-based)
function mod97(numStr) {
  let remainder = 0;
  for (let i = 0; i < numStr.length; i++) {
    remainder = (remainder * 10 + parseInt(numStr[i])) % 97;
  }
  return remainder;
}

// Usage examples
console.log(validateIBAN('GB82 WEST 1234 5698 7654 32')); // true
console.log(validateIBAN('DE89 3704 0044 0532 0130 00')); // true
console.log(validateIBAN('FR14 2004 1010 0505 0001 3M02 606')); // true