Iceland IBAN Validator

In short An Icelandic IBAN is exactly 26 characters: IS, two check digits, then 4 digits, then 2 digits, then 6 digits, then 10 digits — so the 4 characters after the check digits are the bank code — 0159 in the example — the next 2 are the two-digit branch, 26, and the remaining 16 are the account, 0076545510730339. An Icelandic IBAN is twenty-six characters and its tail is not an account number at all — the last ten digits are the holder’s kennitala, the national identity number. Iceland is the only country in the registry that puts a personal identifier inside the IBAN. The checksum is ISO 7064 MOD-97-10: move the first four characters to the end, turn each letter into its position in the alphabet plus nine, and read the result as one long number, which must leave remainder 1 when divided by 97. That catches every single-character mistake and almost every swap of two neighbouring characters, which is what it was designed for and why an IBAN is worth checking before you pay rather than after. What it cannot do is tell you the account exists, is open, or belongs to the person you think — a random string of the right shape passes about once in 97 tries, and no amount of arithmetic reaches into a bank. This page runs entirely in your browser, so the number you type is not sent anywhere.