Free tool
DEAN validator
Check a Digital Euro Account Number — structure and check digits — and see exactly which part is wrong when it fails. Everything runs in your browser.
Paste a DEAN, or generate a test one. Everything is checked in your browser — nothing is sent anywhere.
What this checks
A DEAN is 18 alphanumeric characters, and the validator verifies each part independently so a failure tells you something useful:
| Positions | Part | Rule |
|---|---|---|
| 1–2 | Prefix | Must be the literal EU |
| 3–4 | Check digits | ISO/IEC 7064 MOD 97-10 — the IBAN checksum family |
| 5 | Indicator | 0 individual, 1 business |
| 6–18 | Serial | 13 digits |
Positions 5–18 — the indicator digit plus the serial — are the BEAN. Because the check digits use the same algorithm as the IBAN, a mistyped DEAN can be caught client-side before anything is submitted. That is what this page does: no network request is made, because none is needed.
About the test DEANs
Test data only
Why check digits matter
MOD 97-10 catches every single-character error and virtually every transposition — the two mistakes people actually make when copying an account number. Validating locally turns a failed payment three systems downstream into a red field on a form.
For the full breakdown of the format, why a DEAN deliberately carries no routing information, and what to build around it, read DEAN explained — the IBAN of the digital euro.