Austria IBAN validator
How the IBAN format works
- Format
- AT + 2 check digits + 5-digit bank code + 11-digit account number (20 chars)
- Example
- AT611904300234573201
Things to watch for
- 20 characters total, all digits after the country code
^AT[0-9]{2}[0-9]{5}[0-9]{11}$An Austrian IBAN is 20 characters long: “AT”, two check digits, a 5-digit Bankleitzahl identifying the bank, and an 11-digit account number, all digits with no letters anywhere in the BBAN. Because Austrian account numbers were traditionally shorter than 11 digits under the old domestic system, the IBAN pads the account block with leading zeros to reach the fixed width — a 7- or 8-digit account number becomes an 11-digit block, and that’s normal, not a sign of corruption. Anyone paying an Austrian landlord, supplier, or employee via SEPA, or filling in a form that asks for an IBAN instead of separate bank and account fields, needs the full 20-character string exactly as issued.
How this validator works
This tool checks the “AT” prefix, confirms the Bankleitzahl block is 5 digits and the account block is 11 digits, then runs the real mod-97 checksum (ISO 7064) that generates valid Austrian IBANs — entirely in your browser, with nothing sent to a server and no signup required. Results appear as soon as you stop typing.
What a pass doesn’t tell you
A pass confirms the IBAN is correctly formed and internally consistent — it says nothing about whether the account is open, active, or held by the person you expect. This tool doesn’t resolve a Bankleitzahl to a bank name and never contacts any bank or clearing system. If an IBAN copied from an invoice or contract fails, look first for a dropped leading zero in the account block or a transposed digit in the Bankleitzahl — both are common, easy-to-miss causes.
Scope: Austrian IBAN structure and mod-97 checksum validation only — not SEPA processing, Bankleitzahl-to-bank-name lookup, or confirming an account is active. Use this validator to catch a typo before a transfer fails; use your bank to confirm the account itself.
Content last reviewed 2026-07-07.
IBAN FAQ
What are the 20 characters of an Austrian IBAN?
'AT', two check digits, a 5-digit Bankleitzahl (bank sort code), and an 11-digit account number — for example AT611904300234573201. Every character after the country code is a digit; there are no letters in the Austrian BBAN.
My old Austrian account number is shorter than 11 digits — is that a problem?
No, that's expected. Austrian domestic account numbers are commonly padded with leading zeros to fill the fixed 11-digit block inside the IBAN, so a shorter number on an old statement doesn't mean the IBAN is wrong.
Does this tool tell me which bank a Bankleitzahl belongs to?
No. It validates structure and the mod-97 checksum only. Resolving a Bankleitzahl to a bank name, or confirming an account is active, requires your bank or the Oesterreichische Nationalbank's own registry — this is a pure client-side check.