Congo-Brazzaville IBAN validator
How the IBAN format works
- Format
- CG + 2 check digits + 25 digits (27 chars) — used in practice, not in the official SWIFT IBAN registry
- Example
- CG5500000000000000000100010
Things to watch for
- Congo-Brazzaville is not in the official SWIFT IBAN registry — this 27-character format is used in practice by banks there, not formally standardized by SWIFT/ECBS
- Congo-Brazzaville shares its central bank, BEAC, and the Central African CFA franc (XAF) with 5 other Central African countries — none of which are in the official SWIFT registry either
- Checks format and checksum only — does not confirm the account exists or is held at a real bank
^CG[0-9]{25}$A Congo-Brazzaville IBAN-style account number is 27 characters: “CG”, two check digits, then 25 digits with no letters anywhere — for example CG5500000000000000000100010. The Republic of the Congo, commonly called Congo-Brazzaville to distinguish it from its much larger neighbor the Democratic Republic of the Congo, is not in the official SWIFT/ECBS IBAN registry, but it does share a central bank — BEAC, the Banque des États de l’Afrique Centrale — and the Central African CFA franc (XAF) with five other countries: Cameroon, Central African Republic, Chad, Equatorial Guinea, and Gabon.
Two of those, Gabon and Equatorial Guinea, are Congo-Brazzaville’s direct neighbors, and all six BEAC-zone countries use the identical purely numeric account-block convention this format follows.
How this validator works
This tool checks the “CG” prefix, confirms exactly 25 digits follow the two check digits, and runs the mod-97 checksum (ISO 7064) the number must satisfy. Everything runs client-side, with nothing sent to a server.
What a pass doesn’t tell you
A pass confirms the 27 characters are internally consistent — not that an account exists, or that Congo-Brazzaville has formal SWIFT IBAN registration. This tool performs no lookup against BEAC or any bank operating in the country.
Scope: format and mod-97 checksum validation only, for a locally used but non-SWIFT-registered format — not payment processing or account confirmation.
Content last reviewed 2026-08-10.
IBAN FAQ
Is Congo-Brazzaville part of the official IBAN registry?
No. The Republic of the Congo (Congo-Brazzaville) is not in the official SWIFT/ECBS IBAN registry. Its banks, under the regional central bank BEAC, use a 27-character, all-numeric IBAN-shaped account number that satisfies the mod-97 checksum without formal SWIFT backing.
What does a Congo-Brazzaville IBAN-style number look like?
27 characters: 'CG', two check digits, then 25 digits and no letters — for example CG5500000000000000000100010.
Is this the same as DR Congo's format?
This record covers only the Republic of the Congo (Congo-Brazzaville, ISO code CG), a BEAC-zone country using the Central African CFA franc. The Democratic Republic of the Congo is a separate country with a separate currency and isn't covered here.