Luxembourg IBAN
20 characters: the country code, two check digits, then the BBAN cut as below.
Anatomy of the official example
LU280019400644750000
- Country code
- Check digits
- Bank code
- Account number
The example comes from the ISO 13616 registry; it belongs to nobody. Positions count from the first character of the IBAN.
| ISO code | LU |
|---|---|
| Length | 20 characters |
| Check digits | positions 3 to 4, ISO 7064 mod 97-10 |
| Bank code | positions 5 to 7 · 3!n |
| Account number | positions 8 to 20 · 13!c |
| Official example | LU28 0019 4006 4475 0000 |
| SEPA area | member · SCT, SDD, SCT Inst |
| Verification of Payee | mandatory for the country's providers |
| Bank-code register | ABBL, Luxembourg register of IBAN/BIC codes |
SWIFT notation: n = digits, a = upper-case letters, c = alphanumeric characters; the exclamation mark fixes the exact length.
What the API checks on a Luxembourg IBAN
- The length, the charset of every field and the mod-97 check digits.
- The bank code against ABBL, Luxembourg register of IBAN/BIC codes: the holder of every code it lists, without the weight of a register that settles a negative; the other codes against our composite map.
- The country's SEPA reachability and the open schemes (SCT, SDD, SCT Inst).
- The Verification of Payee duty that does, or does not, bind the country's providers.
What the API answers for this code
The API checks this country's bank codes against ABBL, Luxembourg register of IBAN/BIC codes. We serve that register from a private file rather than publish it, so its answer to this example is not copied here: it is computed live, on the request. Try the example in the playground
Source: ISO 13616 registry for the length, layout and example; API answer captured on 2026-10-21.