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IBAN

Austria IBAN format

A Austria IBAN is 20 characters long and begins AT. Here is what each position holds.

At a glance

Country code
AT
Total length
20 characters
Structure after the check digits
5!n11!n
SEPA area
Yes
Checksum
ISO 7064 MOD-97-10

Position by position

PartPositionsLength
Country code 1–2 2
Check digits 3–4 2
Bankleitzahl (BLZ) 5–9 5
Account number 10–20 11

Positions are counted across the whole IBAN, starting at 1.

Reading the structure

The structure 5!n11!n describes everything after the country code and check digits. Each group is a length followed by a character type: n means digits only, a means uppercase letters only, and c means letters or digits. An exclamation mark means the length is fixed.

This matters when you are typing an IBAN by hand: in a group marked n, a letter O where a zero belongs is a structural error the checker will report, not a checksum failure.

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