IBAN format · BI

Burundi IBAN format: 27 characters.

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

Burundi IBAN structure

BI4210000100010000332045181

Country code: BI
Check digits: 42
Bank code: 10000
Branch code: 10001
Account: 0000332045181

Parts of a Burundi IBAN and their positions
Positions	Part	In the example
1–2	Country code	BI
3–4	Check digits	42
5–9	Bank code	10000
10–14	Branch code	10001
15–27	Account	0000332045181

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 Burundi BBAN format, segment by segment
Positions	Notation	Holds	Example
5–9	5!n	5 digitsBank code	10000
10–14	5!n	5 digitsBranch code	10001
15–25	11!n	11 digits	00003320451
26–27	2!n	2 digits	81

Burundi IBAN example

BI42 1000 0100 0100 0033 2045 181 is the sample the SWIFT IBAN Registry publishes for Burundi: a well-formed IBAN for showing the format, not a real account. Written electronically it has no spaces (BI4210000100010000332045181); 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
10000100010000332045181BI42
Replace each letter with two digits (A = 10 … Z = 35)
B = 11, I = 18
10000100010000332045181111842
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 (BI00…), repeat steps 1–3: remainder 56. The check digits are 98 − 56 = 42.

SEPA

Burundi is not in the Single Euro Payments Area, so SEPA credit transfers and direct debits don’t reach BI 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 BI IBANs from code or an AI agent

REST · GET · no key

curl -s 'https://payopskit.com/api/v1/iban/BI4210000100010000332045181'

MCP · tools/call · validate_iban

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "validate_iban",
    "arguments": {
      "iban": "BI4210000100010000332045181"
    }
  }
}

Response (JSON)

{
  "input": "BI4210000100010000332045181",
  "iban": "BI4210000100010000332045181",
  "print": "BI42 1000 0100 0100 0033 2045 181",
  "valid": true,
  "country": {
    "code": "BI",
    "name": "Burundi",
    "sepa": false,
    "sepaNote": null
  },
  "checkDigits": "42",
  "expectedCheckDigits": "42",
  "length": {
    "actual": 27,
    "expected": 27
  },
  "bban": "10000100010000332045181",
  "bbanFormat": "5!n5!n11!n2!n",
  "bankCode": "10000",
  "branchCode": "10001",
  "parts": [
    {
      "label": "Country code",
      "value": "BI",
      "start": 0,
      "end": 2,
      "kind": "country"
    },
    {
      "label": "Check digits",
      "value": "42",
      "start": 2,
      "end": 4,
      "kind": "check"
    },
    {
      "label": "Bank code",
      "value": "10000",
      "start": 4,
      "end": 9,
      "kind": "bank"
    },
    {
      "label": "Branch code",
      "value": "10001",
      "start": 9,
      "end": 14,
      "kind": "branch"
    },
    {
      "label": "Account",
      "value": "0000332045181",
      "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=BI&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.