Irish Calculators
Banking

Irish IBAN Checker and Account Number Extractor

Enter an Irish IBAN to check its structure and checksum and read the embedded account details. A valid checksum does not confirm that the account exists or belongs to the intended payee.

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Your numbers

Irish IBAN only. Spaces are allowed; account information stays on your device.
Your figures stay on this device.

How the calculation works

An Irish IBAN contains a country prefix, check digits and a structured domestic account identifier. This tool checks the format and arithmetic checksum, then extracts the bank identifier, sort code and account number without contacting a bank.

Remove spaces, validate the Irish 22-character structure, move the first four characters to the end, replace letters A–Z with 10–35 and require modulo 97 = 1.

  1. Check the Irish structure

    The engine expects the Irish 22-character arrangement: country letters, check digits, four bank letters and the domestic numeric section. Other countries use different arrangements and are not parsed here.

  2. Test the checksum

    The first four characters move to the end for the checksum calculation. Letters are converted to numbers and the resulting sequence must leave remainder one when divided by 97.

  3. Extract account components

    After validation, the engine reads the bank identifier, six-digit sort code and eight-digit account number from their defined positions. The values remain text so leading zeros survive.

Worked example: Check Checksum remainder

Sample inputs demonstrate the method. They are not a forecast or product offer.

The first example is IE29AIBK93115212345678. Its rearranged numeric sequence produces remainder one, and the extracted components are AIBK, sort code 931152 and account number 12345678; none of those checks verifies an account holder.

Irish IBAN
IE29AIBK93115212345678

Expected result

Checksum remainder
1
Worked example: Check Checksum remainder

Sample inputs demonstrate the method. They are not a forecast or product offer.

Irish IBAN
IE64IRCE92050112345678

Expected result

Checksum remainder
1

Understanding your result

A successful check means the input has a valid Irish structure and checksum. It does not confirm that the account exists, is open or can receive a particular payment.

The bank letters identify a component of the IBAN, not a verified payee name. Ownership and payment instructions must be confirmed through appropriate channels outside this calculation.

Questions you might have

What does the result include?

Validate the structure and checksum of an Irish IBAN and extract its bank code, sort code and account number.

Which limits should I check?

Irish IBAN only. Never use a checksum alone to verify a payee.

Choosing the right inputs

Irish IBAN
Paste the full Irish IBAN as text; spaces are accepted and letters are normalised. Preserve every digit, including leading zeros, and do not include a heading or explanatory sentence.

Common mistakes to avoid

  • Do not treat checksum success as a fraud or ownership check.
  • Do not remove zeros or convert the account number into a numeric spreadsheet cell before using it.

Assumptions to check

  • Irish IBAN only. Never use a checksum alone to verify a payee.
  • All calculations run on your device. Figures are scenarios based on your inputs, not investment recommendations.

Sources and method

Read our calculation and testing approach.