IBAN format · RO

Romania IBAN format: 24 characters.

Romania IBANs have 24 characters: the country code RO, two check digits and a 20-character BBAN, the national account number, laid out as 4!a16!c.

Romania IBAN structure

RO49AAAA1B31007593840000

Country code: RO
Check digits: 49
Bank code: AAAA
Account: 1B31007593840000

Parts of a Romania IBAN and their positions
Positions	Part	In the example
1–2	Country code	RO
3–4	Check digits	49
5–8	Bank code	AAAA
9–24	Account	1B31007593840000

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. 4!a16!c reads:

The Romania BBAN format, segment by segment
Positions	Notation	Holds	Example
5–8	4!a	4 upper-case lettersBank code: the first four letters of the bank’s BIC	AAAA
9–24	16!c	16 letters or digitsAccount number	1B31007593840000

Romania IBAN example

RO49 AAAA 1B31 0075 9384 0000 is the sample the SWIFT IBAN Registry publishes for Romania: a well-formed IBAN for showing the format, not a real account. Written electronically it has no spaces (RO49AAAA1B31007593840000); 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
AAAA1B31007593840000RO49
Replace each letter with two digits (A = 10 … Z = 35)
A = 10, B = 11, R = 27, O = 24
1010101011131007593840000272449
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 (RO00…), repeat steps 1–3: remainder 49. The check digits are 98 − 49 = 49.

SEPA

Romania is in the Single Euro Payments Area, so SEPA credit transfers and direct debits can reach RO IBANs; whether a given bank takes part is up to that bank.

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 RO IBANs from code or an AI agent

REST · GET · no key

curl -s 'https://payopskit.com/api/v1/iban/RO49AAAA1B31007593840000'

MCP · tools/call · validate_iban

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "validate_iban",
    "arguments": {
      "iban": "RO49AAAA1B31007593840000"
    }
  }
}

Response (JSON)

{
  "input": "RO49AAAA1B31007593840000",
  "iban": "RO49AAAA1B31007593840000",
  "print": "RO49 AAAA 1B31 0075 9384 0000",
  "valid": true,
  "country": {
    "code": "RO",
    "name": "Romania",
    "sepa": true,
    "sepaNote": null
  },
  "checkDigits": "49",
  "expectedCheckDigits": "49",
  "length": {
    "actual": 24,
    "expected": 24
  },
  "bban": "AAAA1B31007593840000",
  "bbanFormat": "4!a16!c",
  "bankCode": "AAAA",
  "branchCode": null,
  "parts": [
    {
      "label": "Country code",
      "value": "RO",
      "start": 0,
      "end": 2,
      "kind": "country"
    },
    {
      "label": "Check digits",
      "value": "49",
      "start": 2,
      "end": 4,
      "kind": "check"
    },
    {
      "label": "Bank code",
      "value": "AAAA",
      "start": 4,
      "end": 8,
      "kind": "bank"
    },
    {
      "label": "Account",
      "value": "1B31007593840000",
      "start": 8,
      "end": 24,
      "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=RO&bban=… or the MCP tool compute_iban_check_digits computes the check digits and the whole IBAN.

Other 24-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.