IBAN Validator

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spain iban validator

Spain IBAN Validator

Spanish IBANs start with ES and have 24 characters, wrapping the CCC (Código Cuenta Cliente) that Spanish banks already used before IBAN.

The Spanish IBAN format

Spain's IBAN has 24 characters: ES, then 2 check digits, then a 20-digit BBAN, which is the full CCC: 4 digits for the bank code (entidad), 4 for the branch (oficina), 2 domestic CCC control digits, and 10 digits for the account number.
Like the French RIB, the Spanish CCC already had its own pair of check digits before the IBAN era, so a valid Spanish IBAN depends on two layered checksums: the domestic CCC one and the IBAN's own mod-97 one.
The check digit follows the same ISO 7064 rule (mod 97-10): the first 4 characters of the provisional IBAN (ES00...) move to the end, each letter becomes two digits (A=10 through Z=35), and the resulting number must leave a remainder of 1 when divided by 97. Before that step, though, the CCC's own 2 control digits already have to check out on their own, computed with a separate modulo-11 algorithm specific to the Spanish banking system, created in the 1970s by the Consejo Superior Bancario.
Spain has been in the eurozone since 1999 and began requiring IBAN for euro transfers from 1 February 2014, under EU Regulation No 260/2012. The 4-digit entidad code is assigned by the Banco de España to every bank authorized to operate in the country, and it remains the way to identify the institution even after being wrapped inside the IBAN.

Examples

Valid Spanish IBAN

Input: ES7921000813610123456789
Expected output: Valid

24 characters, correct mod-97 checksum.

Unknown country code

Input: XX7921000813610123456789
Expected output: Unknown country

XX does not match any country with a registered IBAN format.

Last digit swapped

Input: ES7921000813610123456788
Expected output: Checksum failed

Same valid IBAN with the final digit swapped from 9 to 8: all 24 characters are still correct, but the remainder of the division by 97 is no longer 1.

Full tool FAQ

What does it mean when an IBAN is 'valid'?

It means the IBAN has the correct length for its country and its check digits satisfy the ISO 7064 MOD97-10 checksum defined by ISO 13616. It confirms the number is well-formed and free of typos, it does not confirm that the underlying bank account actually exists or is open, only the account-holding bank can verify that.

Why did my IBAN come back as 'wrong length'?

Why did it say the country code is unknown?

Can two different IBANs have the same check digits?

Does a valid checksum guarantee the account exists?

Why does the BBAN show as one long string instead of bank code and account number?

Is this the same as a SWIFT/BIC code?

Why do some countries not use IBAN at all?

Frequently asked questions

Are the Spanish IBAN and CCC the same thing?

The 20-digit CCC is embedded inside the Spanish IBAN's BBAN, which adds the ES prefix and 2 of its own check digits, so the IBAN is always 4 characters longer than the bare CCC.

How many characters does a Spanish IBAN have?

Always 24.

Do Spanish banks still ask for the CCC separately?

Rarely. Since IBAN was fully adopted for SEPA payments, virtually all operations use the full IBAN, but the CCC is still the underlying number, it's just wrapped inside the IBAN now.

Who assigns the bank code (entidad) inside a Spanish IBAN?

The Banco de España assigns the 4-digit code to every institution authorized to operate in the country; it's the same number the CCC has used since the 1970s, now simply wrapped inside the IBAN.

Next steps

The Spanish IBAN format

Spain's IBAN has 24 characters: ES, then 2 check digits, then a 20-digit BBAN, which is the full CCC: 4 digits for the bank code (entidad), 4 for the branch (oficina), 2 domestic CCC control digits, and 10 digits for the account number.

Like the French RIB, the Spanish CCC already had its own pair of check digits before the IBAN era, so a valid Spanish IBAN depends on two layered checksums: the domestic CCC one and the IBAN's own mod-97 one.

The check digit follows the same ISO 7064 rule (mod 97-10): the first 4 characters of the provisional IBAN (ES00...) move to the end, each letter becomes two digits (A=10 through Z=35), and the resulting number must leave a remainder of 1 when divided by 97. Before that step, though, the CCC's own 2 control digits already have to check out on their own, computed with a separate modulo-11 algorithm specific to the Spanish banking system, created in the 1970s by the Consejo Superior Bancario.

Spain has been in the eurozone since 1999 and began requiring IBAN for euro transfers from 1 February 2014, under EU Regulation No 260/2012. The 4-digit entidad code is assigned by the Banco de España to every bank authorized to operate in the country, and it remains the way to identify the institution even after being wrapped inside the IBAN.

Examples

Valid Spanish IBAN

Input: ES7921000813610123456789
Expected output: Valid

24 characters, correct mod-97 checksum.

Unknown country code

Input: XX7921000813610123456789
Expected output: Unknown country

XX does not match any country with a registered IBAN format.

Last digit swapped

Input: ES7921000813610123456788
Expected output: Checksum failed

Same valid IBAN with the final digit swapped from 9 to 8: all 24 characters are still correct, but the remainder of the division by 97 is no longer 1.

Full tool FAQ

What does it mean when an IBAN is 'valid'?

Why did my IBAN come back as 'wrong length'?

Why did it say the country code is unknown?

Can two different IBANs have the same check digits?

Does a valid checksum guarantee the account exists?

Why does the BBAN show as one long string instead of bank code and account number?

Is this the same as a SWIFT/BIC code?

Why do some countries not use IBAN at all?

Frequently asked questions

Are the Spanish IBAN and CCC the same thing?

The 20-digit CCC is embedded inside the Spanish IBAN's BBAN, which adds the ES prefix and 2 of its own check digits, so the IBAN is always 4 characters longer than the bare CCC.

How many characters does a Spanish IBAN have?

Always 24.

Do Spanish banks still ask for the CCC separately?

Rarely. Since IBAN was fully adopted for SEPA payments, virtually all operations use the full IBAN, but the CCC is still the underlying number, it's just wrapped inside the IBAN now.

Who assigns the bank code (entidad) inside a Spanish IBAN?

The Banco de España assigns the 4-digit code to every institution authorized to operate in the country; it's the same number the CCC has used since the 1970s, now simply wrapped inside the IBAN.