IBAN format · RS

Serbia IBAN format: 22 characters.

Serbia IBANs have 22 characters: the country code RS, two check digits and an 18-character BBAN, the national account number, laid out as 3!n13!n2!n.

Serbia IBAN structure

RS35260005601001611379

Country code: RS
Check digits: 35
Bank code: 260
Account: 005601001611379

Parts of a Serbia IBAN and their positions
Positions	Part	In the example
1–2	Country code	RS
3–4	Check digits	35
5–7	Bank code	260
8–22	Account	005601001611379

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. 3!n13!n2!n reads:

The Serbia BBAN format, segment by segment
Positions	Notation	Holds	Example
5–7	3!n	3 digitsBank code	260
8–20	13!n	13 digits	0056010016113
21–22	2!n	2 digits	79

Serbia IBAN example

RS35 2600 0560 1001 6113 79 is the sample the SWIFT IBAN Registry publishes for Serbia: a well-formed IBAN for showing the format, not a real account. Written electronically it has no spaces (RS35260005601001611379); 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
260005601001611379RS35
Replace each letter with two digits (A = 10 … Z = 35)
R = 27, S = 28
260005601001611379272835
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 (RS00…), repeat steps 1–3: remainder 63. The check digits are 98 − 63 = 35.

SEPA

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

Joined the SEPA schemes in May 2026. Fewer banks there take part so far, and not always in every scheme: check the EPC’s register of scheme participants for the receiving 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 RS IBANs from code or an AI agent

REST · GET · no key

curl -s 'https://payopskit.com/api/v1/iban/RS35260005601001611379'

MCP · tools/call · validate_iban

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "validate_iban",
    "arguments": {
      "iban": "RS35260005601001611379"
    }
  }
}

Response (JSON)

{
  "input": "RS35260005601001611379",
  "iban": "RS35260005601001611379",
  "print": "RS35 2600 0560 1001 6113 79",
  "valid": true,
  "country": {
    "code": "RS",
    "name": "Serbia",
    "sepa": true,
    "sepaNote": "Joined the SEPA schemes in May 2026. Fewer banks there take part so far, and not always in every scheme: check the EPC’s register of scheme participants for the receiving bank."
  },
  "checkDigits": "35",
  "expectedCheckDigits": "35",
  "length": {
    "actual": 22,
    "expected": 22
  },
  "bban": "260005601001611379",
  "bbanFormat": "3!n13!n2!n",
  "bankCode": "260",
  "branchCode": null,
  "parts": [
    {
      "label": "Country code",
      "value": "RS",
      "start": 0,
      "end": 2,
      "kind": "country"
    },
    {
      "label": "Check digits",
      "value": "35",
      "start": 2,
      "end": 4,
      "kind": "check"
    },
    {
      "label": "Bank code",
      "value": "260",
      "start": 4,
      "end": 7,
      "kind": "bank"
    },
    {
      "label": "Account",
      "value": "005601001611379",
      "start": 7,
      "end": 22,
      "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=RS&bban=… or the MCP tool compute_iban_check_digits computes the check digits and the whole IBAN.

Other 22-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.