You can check the IBAN right or wrong. Also you can check it offline, you don't need internet for it.

These countries are supported:
- Albania
- Andorra
- Austria
- Azerbaijan
- Belgium
- Bahrain
- Bosnia and Herzegovina
- Bulgaria
- Costa Rica
- Croatia
- Cyprus
- Czech Republic
- Denmark
- Dominican Republic
- Estonia
- Faroe Islands
- Finland
- France
- Georgia
- Germany
- Gibraltar
- Greece
- Greenland
- Hungary
- Iceland
- Ireland
- Israel
- Italy
- Kazakhstan
- Kuwait
- Latvia
- Lebanon
- Liechtenstein
- Lithuania
- Luxembourg
- Macedonia
- Malta
- Mauritania
- Mauritius
- Monaco
- Moldova
- Montenegro
- Netherlands
- Norway
- Pakistan
- Poland
- Portugal
- Romania
- San Marino
- Saudi Arabia
- Serbia
- Slovakia
- Slovenia
- Spain
- Sweden
- Switzerland
- Tunisia
- Turkey
- United Arab Emirates
- United Kingdom
- Virgin Islands, British