Mauritania IBAN validator
How the IBAN format works
- Format
- MR + 2 check digits + 23-digit bank/branch/account number (27 chars)
- Example
- MR1300020001010000123456753
Things to watch for
- 27 characters total, all numeric after the country code
- Checks structure and checksum only, not that the account exists
^MR[0-9]{2}[0-9]{23}$A Mauritanian IBAN is 27 characters: “MR”, two check digits, and 23 digits with no letters anywhere, combining the bank, branch, and account identifiers into one continuous numeric block. Mauritania shares the fully numeric, RIB-derived IBAN approach used by several of its Maghreb neighbors, but its combined bank/branch/account block runs longer — 23 digits against Tunisia’s 20 — making it, alongside San Marino, one of the longer IBAN formats among this batch of newly covered countries. Anyone wiring funds to or from a Mauritanian account needs all 23 digits exactly right, since there’s no letter-based bank code to sanity-check the block against.
How this validator works
This tool checks for the “MR” prefix, confirms exactly 23 digits follow the two check digits with no letters present, and then runs the mod-97 (ISO 7064) checksum a correctly generated Mauritanian IBAN must satisfy — entirely client-side, with nothing sent to a server and no signup.
What a pass doesn’t tell you
A pass confirms the 27 digits are correctly structured and pass the checksum, not that the account exists, is open, or belongs to a specific person or business. This validator never contacts the Central Bank of Mauritania or any commercial bank there. If a Mauritanian IBAN fails, work through the 23-digit block in groups of four or five rather than all at once — a single-digit slip is far easier to catch in a long unbroken numeric string when you chunk it.
Scope: structure and mod-97 checksum validation for Mauritanian IBANs only — not payment processing, bank verification, or confirming an account is active. Use it to catch a typo before you send funds.
Content last reviewed 2026-07-09.
IBAN FAQ
What does a Mauritanian IBAN look like?
27 characters, all digits after the prefix: 'MR', two check digits, then 23 digits combining the bank, branch, and account identifiers — for example MR1300020001010000123456753. It's four characters longer than Tunisia's IBAN despite the same all-numeric approach.
Why is Mauritania's IBAN longer than Tunisia's if both are fully numeric?
The extra length comes down to how each central bank sized its domestic account-numbering scheme before adopting IBAN — Mauritania's 23-digit combined bank/branch/account block simply needed more room than Tunisia's 20-digit version, even though neither format uses any letters.
Does a passing check confirm the Mauritanian account is real?
No. This tool only confirms the 27 digits are correctly structured and pass the mod-97 checksum — it does not contact the Central Bank of Mauritania or any commercial bank there, so it can't confirm the account is open or belongs to the person you're paying.