IBAN Validator

How to use it

1. Paste the IBAN from your statement, invoice or bank app. Spaces and small letters do not matter.
2. Read the Result: green means the IBAN passes the length, layout and check-digit tests.
3. If it is red, read the reason, check the digit or letter it names against the original, and run the check again.
4. Use Bank code, Bank name and In groups of four to compare the number with your papers.

How an IBAN is checked

An IBAN (International Bank Account Number) has three parts: a two-letter country code, two check digits, then the account part whose length and layout depend on the country. The SWIFT IBAN Registry gives those rules for 89 countries and territories. The page applies the registry's length and layout to the IBAN you enter.

The check digits are calculated with the mod 97 method of ISO 7064. The first four characters are moved to the end, each letter becomes two digits (A = 10 to Z = 35), and the resulting number must leave remainder 1 when divided by 97.

remainder = (number formed from the IBAN, first four characters moved to the end) mod 97
valid when remainder = 1

The check digits needed: 98 − (remainder of the number with 00 in place of the check digits)

• The country code must be in the registry, and the length must be the registry's length for that country.
• Each character must be of the kind the registry gives: a digit, a capital letter, or a letter or digit.
• Only then is the mod 97 check made.

What a valid IBAN does not prove

A valid IBAN is well formed. It does not show that the account exists, that it is open, or that it belongs to the person or company you want to pay. Those are checked by the bank, and some banks and payment services also check the account name before a transfer.

Nothing is looked up: the page only works out the rules above, in your browser. The IBAN you type is not stored or sent to us. Bank codes are read from the position the registry gives; the page does not say which bank a code belongs to.

The IBAN of Türkiye

A Turkish IBAN has 26 characters: TR, two check digits, a five-digit bank code, a reserve digit and a 16-character account number. The registry writes this layout as 2!n5!n1!n16!c.

The bank code is the five digits right after the check digits, here 00061. The reserve digit follows the bank code; the registry gives it as one digit and does not describe more.

Which bank a Turkish code belongs to

For a valid Turkish IBAN the page looks up the five-digit bank code in the list of payment system participants that the Central Bank of the Republic of Türkiye (TCMB) publishes: “TCMB Ödeme Sistemleri Katılımcıları (2026)”, a PDF linked from the TCMB page for the Electronic Fund Transfer (EFT) system. The list has 70 banks and writes each code with four digits. An IBAN takes five, so the list's 0010 is written 00010 in an IBAN. The name is shown as the list writes it. The page's copy of the list was checked on 10 November 2026.

The list's footnote also names a bank that left the payment systems on 18 September 2026, Golden Global Yatırım Bankası A.Ş. (code 0150). Its name is shown with that date. If the code is in neither the table nor the footnote, the page shows “Bank code not on the list”. That is not a verdict on the IBAN, which may still be valid: the list covers only the banks that take part in the TCMB payment systems.

Frequently asked questions