Andorra IBAN validator
How the IBAN format works
- Format
- AD + 2 check digits + 4-digit bank code + 4-digit branch code + 12-char account number (24 chars)
- Example
- AD1200012030200359100100
Things to watch for
- 24 characters total
- We check structure and checksum, not whether the account exists
^AD[0-9]{2}[0-9]{4}[0-9]{4}[0-9A-Z]{12}$An Andorran IBAN runs to 24 characters: “AD”, two check digits, a 4-digit bank code, a 4-digit branch code, and a 12-character account number, written with no spaces in the form your bank’s systems actually process. That final 12-character block is alphanumeric rather than purely numeric, which sets Andorra apart from several of its neighbors and is worth knowing before you assume a letter in that segment is a mistake. Anyone paying an Andorran business, settling a cross-border invoice, or entering a payment reference in a form that demands an IBAN rather than a local account number needs all 24 characters correct, in order, with the bank and branch codes intact.
How this validator works
This tool checks the “AD” prefix, confirms the bank code block is 4 digits, the branch code block is 4 digits, and the account block is 12 alphanumeric characters, then runs the mod-97 checksum (ISO 7064) that Andorran banks use when generating a valid IBAN — entirely client-side, in your browser, with no signup and no server round-trip. You’ll see the result the moment you stop typing.
What a pass doesn’t tell you
A pass here means the IBAN is correctly structured and internally consistent — nothing more. This tool does no lookup against the Andorran Banking Association or any bank, and it can’t confirm the account exists, is active, or belongs to the person you expect. If a number you were given fails, check first for a transposed digit inside the bank code or branch code block, or a misread character in the alphanumeric account segment — both are common sources of an otherwise-plausible Andorran IBAN failing the checksum.
Scope: structure and mod-97 checksum validation only — not payment processing, bank-name resolution, or confirmation that an account is open, none of which a client-side check can establish. Use this validator to catch a typo before a transfer fails; use your own bank to confirm the account itself.
Content last reviewed 2026-07-07.
IBAN FAQ
How long is an Andorran IBAN?
24 characters: 'AD', two check digits, a 4-digit bank code, a 4-digit branch code, and a 12-character account number that may include letters as well as digits — for example AD1200012030200359100100.
Can the account block contain letters, not just numbers?
Yes. Unlike many neighboring countries, Andorra's 12-character account block is defined as alphanumeric, so a valid IBAN can legitimately mix letters and digits in that final segment — don't assume a letter there is a typo before checking your statement.
Does a passing result confirm the account is open at an Andorran bank?
No. This tool only confirms the 24 characters are correctly formatted and satisfy the mod-97 checksum — it never contacts a bank or the Andorran Banking Association, and it can't tell you whether the account is active or belongs to a particular person.