IBAN format · MR

Mauritania IBAN format: 27 characters.

Mauritania IBANs have 27 characters: the country code MR, two check digits and a 23-character BBAN, the national account number, laid out as 5!n5!n11!n2!n.

Mauritania IBAN structure

MR1300020001010000123456753

Country code: MR
Check digits: 13
Bank code: 00020
Branch code: 00101
Account: 0000123456753

Parts of a Mauritania IBAN and their positions
Positions	Part	In the example
1–2	Country code	MR
3–4	Check digits	13
5–9	Bank code	00020
10–14	Branch code	00101
15–27	Account	0000123456753

The BBAN, segment by segment

The registry writes the BBAN in SWIFT notation: n is a digit, a an upper-case letter, c a letter or digit, and the ! means a fixed length. 5!n5!n11!n2!n reads:

The Mauritania BBAN format, segment by segment
Positions	Notation	Holds	Example
5–9	5!n	5 digitsBank code	00020
10–14	5!n	5 digitsBranch code	00101
15–25	11!n	11 digits	00001234567
26–27	2!n	2 digits	53

Mauritania IBAN example

MR13 0002 0001 0100 0012 3456 753 is the sample the SWIFT IBAN Registry publishes for Mauritania: a well-formed IBAN for showing the format, not a real account. Written electronically it has no spaces (MR1300020001010000123456753); on paper it is printed in groups of four.

Its check digits, worked through with ISO 7064 mod 97-10:

Move the country code and check digits to the end
00020001010000123456753MR13
Replace each letter with two digits (A = 10 … Z = 35)
M = 22, R = 27
00020001010000123456753222713
Divide that number by 97 and keep the remainder
Remainder 1. A valid IBAN always leaves 1, so the check digits are right.
Where the check digits come from
Put 00 in their place (MR00…), repeat steps 1–3: remainder 85. The check digits are 98 − 85 = 13.

SEPA

Mauritania is not in the Single Euro Payments Area, so SEPA credit transfers and direct debits don’t reach MR IBANs.

What the format can and can’t tell you

Valid means the structure and check digits are right — not that the account exists or can receive payments.
National check digits inside the BBAN (e.g. the French RIB key, or the Spanish, Belgian and Italian CIN digits) are not verified.
Bank and branch codes are read from their positions; they are not looked up in a bank directory.

Check MR IBANs from code or an AI agent

REST · GET · no key

curl -s 'https://payopskit.com/api/v1/iban/MR1300020001010000123456753'

MCP · tools/call · validate_iban

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "validate_iban",
    "arguments": {
      "iban": "MR1300020001010000123456753"
    }
  }
}

Response (JSON)

{
  "input": "MR1300020001010000123456753",
  "iban": "MR1300020001010000123456753",
  "print": "MR13 0002 0001 0100 0012 3456 753",
  "valid": true,
  "country": {
    "code": "MR",
    "name": "Mauritania",
    "sepa": false,
    "sepaNote": null
  },
  "checkDigits": "13",
  "expectedCheckDigits": "13",
  "length": {
    "actual": 27,
    "expected": 27
  },
  "bban": "00020001010000123456753",
  "bbanFormat": "5!n5!n11!n2!n",
  "bankCode": "00020",
  "branchCode": "00101",
  "parts": [
    {
      "label": "Country code",
      "value": "MR",
      "start": 0,
      "end": 2,
      "kind": "country"
    },
    {
      "label": "Check digits",
      "value": "13",
      "start": 2,
      "end": 4,
      "kind": "check"
    },
    {
      "label": "Bank code",
      "value": "00020",
      "start": 4,
      "end": 9,
      "kind": "bank"
    },
    {
      "label": "Branch code",
      "value": "00101",
      "start": 9,
      "end": 14,
      "kind": "branch"
    },
    {
      "label": "Account",
      "value": "0000123456753",
      "start": 14,
      "end": 27,
      "kind": "account"
    }
  ],
  "checks": {
    "characters": true,
    "country": true,
    "length": true,
    "bbanFormat": true,
    "checksum": true
  },
  "errors": [],
  "notes": [
    "Valid means the structure and check digits are right — not that the account exists or can receive payments.",
    "National check digits inside the BBAN (e.g. the French RIB key, or the Spanish, Belgian and Italian CIN digits) are not verified."
  ]
}

The MCP server is at /mcp (Streamable HTTP, no key); the API and MCP docs show how to connect Claude, Cursor or VS Code.

From a national account number: GET /api/v1/iban/check-digits?country=MR&bban=… or the MCP tool compute_iban_check_digits computes the check digits and the whole IBAN.

Other 27-character IBANs

The same length doesn’t mean the same structure: compare the BBAN formats. All IBAN formats and lengths

Source: the SWIFT IBAN Registry (ISO 13616), transcribed and checked against each country’s registry example; the positions of bank and branch codes are given only where the registry’s are well established. The SWIFT IBAN Registry is the authority. Informational only.