IBAN Validator

International Bank Account Number — mod-97 checksum per ISO 13616.

International Validation Generation

Try the demo NuGet: DocumentNumber.InternationalBankAccountNumber.Validator

How validation works

The validator moves the check digits to the end, applies the ISO 13616 mod-97-10 algorithm and accepts the IBAN only when the remainder is 1.

Install the package

bash

dotnet add package DocumentNumber.InternationalBankAccountNumber.Validator

Validator in C#

Program.cs

using DocumentNumber.InternationalBankAccountNumber.Validator;

var validator = new InternationalBankAccountNumberValidator();
var isValid = validator.Validate("PT50000201231234567890154");

Console.WriteLine(isValid ? "Valid" : "Invalid");

Live example

PT50000201231234567890154 — a real IBAN value accepted by the validator

Try IBAN validation

Runs the exact same library code your application uses. Nothing you enter is stored.

Frequently asked questions

What is IBAN?

International Bank Account Number — mod-97 checksum per ISO 13616.

How does IBAN validation work?

The validator moves the check digits to the end, applies the ISO 13616 mod-97-10 algorithm and accepts the IBAN only when the remainder is 1.

How do I install the IBAN validator package?

dotnet add package DocumentNumber.InternationalBankAccountNumber.Validator

Is the value I enter in the demo stored?

No. Demo inputs are processed in memory for the current request only and are never persisted or shared.