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Azerbaijan IBAN Validator

Validates an Azerbaijani IBAN: the mod-97 checksum, the 28-character length and the structure, with the BIC-derived bank code identified.

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In short An Azerbaijani IBAN is exactly 28 characters: AZ, two check digits, then 4 letters, then 20 letters or digits — so the 4 characters after the check digits are the BIC-derived bank code — NABZ in the example — and the remaining 20 are the account number, 00000000137010001944. The Azerbaijani BBAN opens with four letters rather than digits, which is what fixes the bank code without needing a national lookup table — the letters are taken from the bank’s BIC. 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.

How to use the Azerbaijan IBAN Validator

  1. Paste the Azerbaijani IBAN — spaces and dashes are fine.
  2. Read the three checks: mod-97, length and structure.
  3. If it fails, the page says which check failed and what that usually means.

About the Azerbaijan IBAN Validator

Checks an Azerbaijani IBAN three ways — checksum, length and structure — and says which of the three failed when one does, because they mean different things.

What people use it for

  • Checking an Azerbaijani IBAN before sending money to it.
  • Finding the BIC-derived bank code inside an IBAN you have been given.
  • Confirming an Azerbaijani number was typed or pasted correctly.

Details

Length28 characters, always
Structure4!a20!c after the check digits
In wordsAZ, 2 check digits, then 4 letters, then 20 letters or digits
BIC-derived bank code4 characters — NABZ in the example
ExampleAZ21 NABZ 0000 0000 1370 1000 1944
Check digitsAlways between 02 and 98. 00, 01 and 99 cannot occur
PrivacyThe arithmetic runs in your browser. Nothing you type is sent anywhere

The maths behind it

This tool uses ISO 7064 MOD-97-10 — move the first four characters to the end, replace each letter with its position plus nine, and a valid IBAN leaves remainder 1 on division by 97. On top of that, Azerbaijani IBANs are exactly 28 characters and follow 4!a20!c. Every intermediate value is shown on screen, so the result can be checked by hand.

Three checks, reported separately on purpose. A length error means a character is missing or extra, a structure error means a letter sits where a digit belongs, and a checksum failure with both of those right means a genuine typo inside the number — most often two neighbouring characters swapped.

Where this tool stops

It checks arithmetic and shape. It cannot tell you the account exists or who it belongs to, it does not look the bank up, and it does not verify any national check digits Azerbaijan may use inside its own account number — those are separate rules, computed differently, and passing mod-97 says nothing about them.

Frequently asked questions

How many characters is an Azerbaijani IBAN?
Exactly 28, with no exceptions. After the two check digits the structure is 4!a20!c — 4 letters, then 20 letters or digits. A number of any other length is not an Azerbaijani IBAN, whatever else about it looks right.
Why does an Azerbaijani IBAN contain letters?
Because the registry defines the first four BBAN characters as letters, drawn from the bank’s BIC. That is also why this page can point at the bank code with confidence: the structure itself says those four characters are not part of the account number.
Where is the bank code in an Azerbaijani IBAN?
The 4 characters after the check digits are the BIC-derived bank code — NABZ in the example — and the remaining 20 are the account number, 00000000137010001944.
Does a valid checksum mean the account exists?
No, and this is the thing worth taking away. Mod-97 proves the number is internally consistent — that it was probably typed correctly. It says nothing about whether the account is open, or whose it is. A random string of the right length passes about once in every 97 attempts. Only the bank can confirm the rest.
Is it safe to paste an IBAN here?
The checking happens in your browser and the number is never sent to a server — there is no request to make one. An IBAN is not a secret the way a card number is, since it is printed on every invoice you send, but it is still yours, and it does not leave your machine here.
Is the Azerbaijan IBAN Validator free?
It is free, with no account, no trial and no daily cap. Every security tool on inputtesthub.com works the same way: open the page and use it.
Is what I paste into the Azerbaijan IBAN Validator stored?
No. The Azerbaijan IBAN Validator runs entirely in your browser using JavaScript. Your input never reaches inputtesthub.com or any third party — open your browser's Network tab while you use it and you will see no request go out.
What is the equation behind the Azerbaijan IBAN Validator?
It uses ISO 7064 MOD-97-10 — move the first four characters to the end, replace each letter with its position plus nine, and a valid IBAN leaves remainder 1 on division by 97. On top of that, Azerbaijani IBANs are exactly 28 characters and follow 4!a20!c. The full working is printed under the result, so you can follow every step rather than trusting a black box.
Who is the Azerbaijan IBAN Validator for?
The most common reasons people reach for it: checking an Azerbaijani IBAN before sending money to it. Finding the BIC-derived bank code inside an IBAN you have been given. Confirming an Azerbaijani number was typed or pasted correctly. It is built for exactly those cases rather than being a general-purpose tool with this bolted on.
When is the Azerbaijan IBAN Validator not the right tool?
It checks arithmetic and shape. It cannot tell you the account exists or who it belongs to, it does not look the bank up, and it does not verify any national check digits Azerbaijan may use inside its own account number — those are separate rules, computed differently, and passing mod-97 says nothing about them. Knowing where a tool stops being trustworthy matters more than the cases where it works.
Which values should I know?
Length is 28 characters, always. Structure is 4!a20!c after the check digits. In words is AZ, 2 check digits, then 4 letters, then 20 letters or digits. These are printed on the page itself, so you do not have to take them on trust.
Does the Azerbaijan IBAN Validator work on a phone?
Yes. The page is responsive and the tool works in Chrome, Safari, Firefox, Edge and Samsung Internet on both Android and iOS. There is no app to install and nothing to sign into.

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