How long is an IBAN from Spain?

24 characters, written in groups of four on paper (ES98 1234 5678 9012 3456 7890 as a synthetic example).

Can I find the bank from the IBAN?

The bank identifier is the 4 characters at positions 5–8; the bank’s name and BIC are in SWIFT’s licensed directory, which the API does not resolve.

Does a valid IBAN mean the account exists?

No. The check digits and the structure say the IBAN is well formed; existence and ownership are known to the bank only, at payment time.

Spain IBAN format

An IBAN from Spain is 24 characters long: the country code ES, two check digits, then 4 digits (bank code), 4 digits (branch code), 1 digit (account number), 1 digit (national part (check key or type)), 10 digits (national part (check key or type)). Spain is in SEPA. Length and structure from the SWIFT IBAN Registry (ISO 13616), transcribed 2026-10-24; the SEPA flag from the EPC list.

Published 2026-10-28

Structure

24 characters in all. Registry notation of the BBAN: 4!n4!n1!n1!n10!n (n digits, a upper-case letters, c alphanumerics, ! fixed length).

Position	Length	Characters	Meaning
1–2	2	letters	country code ES
3–4	2	digits	check digits (ISO 7064 mod 97-10)
5–8	4	digits	bank code
9–12	4	digits	branch code
13–13	1	digits	account number
14–14	1	digits	national part (check key or type)
15–24	10	digits	national part (check key or type)

Example

ES98 1234 5678 9012 3456 7890 is a synthetic example: placeholder characters in every part, with the check digits computed so that the mod-97 test passes. It is not a real account and no bank issued it; use it to test an input field, not to pay.

SEPA

Spain is in the geographical scope of the SEPA schemes: a euro credit transfer to this IBAN costs the same as a domestic one and arrives within one business day (seconds with SCT Inst).

Check one

The API checks the characters, the country, the length (24), the mod-97 check digits and the BBAN pattern, and returns the bank and branch identifier.

curl — validate an IBAN from Spain

curl "https://veriport.io/api/v1/iban/validate?iban=ES9812345678901234567890"

Questions

How long is an IBAN from Spain?: 24 characters, written in groups of four on paper (ES98 1234 5678 9012 3456 7890 as a synthetic example).
Can I find the bank from the IBAN?: The bank identifier is the 4 characters at positions 5–8; the bank’s name and BIC are in SWIFT’s licensed directory, which the API does not resolve.
Does a valid IBAN mean the account exists?: No. The check digits and the structure say the IBAN is well formed; existence and ownership are known to the bank only, at payment time.

Free: five checks, bank identifier, SEPA flag.

Check an IBAN

Sources

IBAN Registry (ISO 13616) — country lengths, BBAN structures, SEPA membership — SWIFT, ISO 13616 registration authority, consulted 2026-10-24. Transcribed from the public registry; the release number in force on the day checkout opens must be written on the IBAN docs page (owner step).
ISO 13616-1:2020 — Financial services — International bank account number (IBAN): structure and mod 97-10 check (ISO/IEC 7064) — ISO, consulted 2026-10-24
EPC list of SEPA scheme countries (geographical scope of the SEPA schemes) — European Payments Council, consulted 2026-10-24. The 2025 additions (Albania, Moldova, Montenegro, North Macedonia, effective 5 October 2025) are flagged `sepaSince` on the row.