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This is a C library to check the validity of German and Austrian Bank Account Numbers. All currently defined test methods by Deutsche Bundesbank (Nov 2016: 00 to E2) are implemented. Modules for AWK, Perl, PHP, Python, Ruby, C#.net and VB.net are included too.

The package includes also an IBAN converter to generate (german) IBANs and BICs from account data. All currently defined IBAN rules by Deutsche Bundesbank are implemented (Nov 2016: 57 rules) and tested against independent solutions.

konto_check Web Site


  • very fast, portable check of account numbers
  • tested on many different systems by the CPAN testers
  • powerful, easy to use interface
  • well-tested IBAN converter included


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Additional Project Details



Intended Audience

Financial and Insurance Industry, Advanced End Users, Developers

User Interface

Web-based, Console/Terminal

Programming Language

Perl, C, PHP, Ruby, AWK, Java



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