<Tr> <Td> United Kingdom </Td> <Td> GB29 NWBK 6016 1331 9268 19 </Td> </Tr> <P> Permitted IBAN characters are the digits 0 to 9 and the 26 upper - case Latin alphabetic characters A to Z . This applies even in countries (e.g., Thailand) where these characters are not used in the national language . </P> <P> The Basic Bank Account Number (BBAN) format is decided by the national central bank or designated payment authority of each country . There is no consistency between the formats adopted . The national authority may register its BBAN format with SWIFT, but is not obliged to do so . It may adopt IBAN without registration . SWIFT also acts as the registration authority for the SWIFT system, which is used by most countries that have not adopted IBAN . A major difference between the two systems is that under SWIFT there is no requirement that BBANs used within a country be of a pre-defined length . </P> <P> The BBAN must be of a fixed length for the country and comprise case - insensitive alphanumeric characters . It includes the domestic bank account number, branch identifier, and potential routing information . Each country can have a different national routing / account numbering system, up to a maximum of 30 alphanumeric characters . </P>

Which part of an iban is the account number