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GET
https://bankvalidation.cleariflow.com
/
v1
/
iban
IBAN validation
curl --request GET \
  --url https://bankvalidation.cleariflow.com/v1/iban/
{
  "iban": "DE89370400440532013000",
  "is_valid": true,
  "country_code": "DE",
  "country_name": "Germany",
  "bank_code": "37040044",
  "account_number": "0532013000",
  "length": 22,
  "expected_length": 22,
  "checksum_valid": true,
  "format_valid": true,
  "details": {
    "structure": "BBBB BBBB BBBB BBBB BB",
    "example": "DE89 3704 0044 0532 0130 00",
    "bank_name": "Bank information not available",
    "bank_bic": "BIC not available",
    "account_type": "Bank Account",
    "currency": "EUR"
  }
}

​
Getting started

​
Base URL

https://bankvalidation.cleariflow.com/v1/iban/

​
Validation endpoint

The iban endpoint requires your API key and an IBAN parameter to perform comprehensive validation of International Bank Account Numbers. 
https://bankvalidation.cleariflow.com/v1/iban/
? api_key = YOUR_UNIQUE_API_KEY
& iban = DE89370400440532013000
This successful request validates a German IBAN and returns detailed information: 
{
  "iban": "DE89370400440532013000",
  "is_valid": true,
  "country_code": "DE",
  "country_name": "Germany",
  "bank_code": "37040044",
  "account_number": "0532013000",
  "length": 22,
  "expected_length": 22,
  "checksum_valid": true,
  "format_valid": true,
  "details": {
    "structure": "BBBB BBBB BBBB BBBB BB",
    "example": "DE89 3704 0044 0532 0130 00",
    "bank_name": "Bank information not available",
    "bank_bic": "BIC not available",
    "account_type": "Bank Account",
    "currency": "EUR"
  }
}

​
Request parameters

​
api_key
String
required
Your unique API key. Note that each user has unique API keys for each of Cleariflow APIs, so your Bank Validation API key will not work for your Exchange Rates API, for example.
​
iban
String
required
The International Bank Account Number to validate. Spaces are allowed and will be automatically removed during processing. The IBAN should follow the ISO 13616 standard format.

​
Response parameters

The API response is returned in a universal and lightweight JSON format.
​
iban
String
The normalized IBAN without spaces, returned in uppercase format.
​
is_valid
Boolean
Overall validation result indicating whether the IBAN is valid according to all validation rules.
​
country_code
String
The two-letter ISO country code (e.g., DE for Germany, FR for France).
​
country_name
String
The full name of the country associated with the IBAN.
​
bank_code
String
The bank identifier code extracted from the IBAN according to the country’s specific format.
​
account_number
String
The account number portion of the IBAN, excluding country code, checksum, and bank code.
​
length
Integer
The actual length of the provided IBAN.
​
expected_length
Integer
The expected length for IBANs from the specific country according to ISO 13616 standard.
​
checksum_valid
Boolean
Whether the IBAN checksum validation passed using the MOD-97 algorithm.
​
format_valid
Boolean
Whether the IBAN format matches the expected structure for the country.
​
details
Object
Additional detailed information about the IBAN structure and formatting.
​
details.structure
String
A visual representation of the IBAN structure using B (Bank), S (Sort), C (Customer), and K (Key) placeholders.
​
details.example
String
A properly formatted example of the IBAN with spaces for readability.
​
details.bank_name
String
The name of the bank (currently shows “Bank information not available”).
​
details.bank_bic
String
The BIC code for the bank (currently shows “BIC not available”).
​
details.account_type
String
The type of account (typically “Bank Account”).
​
details.currency
String
The currency code for the country (e.g., EUR for Eurozone countries, GBP for UK).

​
Examples

​
Valid German IBAN

Request: 
GET https://bankvalidation.cleariflow.com/v1/iban/?api_key=YOUR_API_KEY&iban=DE89370400440532013000
Response: 
{
  "iban": "DE89370400440532013000",
  "is_valid": true,
  "country_code": "DE",
  "country_name": "Germany",
  "bank_code": "37040044",
  "account_number": "0532013000",
  "length": 22,
  "expected_length": 22,
  "checksum_valid": true,
  "format_valid": true,
  "details": {
    "structure": "BBBB BBBB BBBB BBBB BB",
    "example": "DE89 3704 0044 0532 0130 00",
    "bank_name": "Bank information not available",
    "bank_bic": "BIC not available",
    "account_type": "Bank Account",
    "currency": "EUR"
  }
}

​
Valid French IBAN

Request: 
GET https://bankvalidation.cleariflow.com/v1/iban/?api_key=YOUR_API_KEY&iban=FR1420041010050500013M02606
Response: 
{
  "iban": "FR1420041010050500013M02606",
  "is_valid": true,
  "country_code": "FR",
  "country_name": "France",
  "bank_code": "2004101005",
  "account_number": "0500013M02606",
  "length": 27,
  "expected_length": 27,
  "checksum_valid": true,
  "format_valid": true,
  "details": {
    "structure": "BBBB BSSS SSCC CCCC CCCC CCC KK",
    "example": "FR14 2004 1010 0505 0001 3M02 606",
    "bank_name": "Bank information not available",
    "bank_bic": "BIC not available",
    "account_type": "Bank Account",
    "currency": "EUR"
  }
}

​
Invalid IBAN

Request: 
GET https://bankvalidation.cleariflow.com/v1/iban/?api_key=YOUR_API_KEY&iban=INVALID
Response: 
{
  "iban": "",
  "is_valid": false,
  "country_code": "",
  "country_name": "",
  "bank_code": "",
  "account_number": "",
  "length": 7,
  "expected_length": 0,
  "checksum_valid": false,
  "format_valid": false,
  "details": {
    "structure": "",
    "example": ""
  }
}

​
Error handling

​
Missing IBAN parameter

Request: 
GET https://bankvalidation.cleariflow.com/v1/iban/?api_key=YOUR_API_KEY
Response: 
{
  "error": {
    "message": "Missing iban",
    "code": "missing_iban"
  }
}

​
Missing API key

Request: 
GET https://bankvalidation.cleariflow.com/v1/iban/?iban=DE89370400440532013000
Response: 
{
  "error": {
    "message": "API key is required",
    "code": "missing_api_key"
  }
}

​
IBAN Structure

The IBAN consists of several components:
  1. Country Code (2 characters): ISO 3166-1 alpha-2 country code
  2. Check Digits (2 characters): MOD-97 algorithm validation
  3. Bank Identifier: Country-specific bank code
  4. Account Number: Customer account identifier

​
Country-specific formats

Different countries have varying IBAN structures:
  • Germany (DE): 22 characters - BBBB BBBB BBBB BBBB BB
  • France (FR): 27 characters - BBBB BSSS SSCC CCCC CCCC CCC KK
  • Italy (IT): 27 characters - CAAA AABB BBSS CCCC CCCC CCX
  • United Kingdom (GB): 22 characters - BBBB SSSS SSCC CCCC CC
  • Spain (ES): 24 characters - BBBB SSSS DDCC CCCC CCCC CC
Where:
  • B = Bank code
  • S = Sort code
  • C = Customer account number
  • K = Key/Check digit
  • A = Account type
  • D = Control digit

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Validation Rules

The API performs comprehensive validation including:
  1. Format Validation: Checks if the IBAN follows the expected structure for the country
  2. Length Validation: Verifies the IBAN length matches the country standard
  3. Checksum Validation: Performs MOD-97 algorithm validation
  4. Country Code Validation: Ensures the country code is supported
  5. Character Validation: Checks for valid alphanumeric characters

​
Supported Countries

The API supports IBAN validation for 50+ countries including:
  • Europe: Germany, France, Italy, Spain, Netherlands, Belgium, Austria, Switzerland, UK, Poland
  • Asia: UAE, Bahrain, Israel, Jordan, Kazakhstan, Kuwait
  • Americas: Brazil, Costa Rica, Dominican Republic, Guatemala
  • Africa: Mauritania, Mauritius, Tunisia
For a complete list of supported countries, see the Supported Countries page.