IBAN Validator

About IBAN

The International Bank Account Number (IBAN) is an international standard for identifying bank accounts across borders. It was originally developed to facilitate payments within the European Union but is now used worldwide.

IBAN Structure:

  • Country Code - 2 letters (e.g., GB for United Kingdom)
  • Check Digits - 2 digits for validation
  • BBAN - Basic Bank Account Number (varies by country, up to 30 characters)

Validation Process:

  1. Check the IBAN length (15-34 characters)
  2. Verify the format (2 letters, 2 digits, then alphanumeric)
  3. Move the first 4 characters to the end
  4. Convert letters to numbers (A=10, B=11, etc.)
  5. Calculate mod-97 of the numeric string
  6. Valid if the result equals 1

Note: This tool only validates the IBAN format and check digits. It does not verify if the account actually exists or is active.