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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 (March 2014: 00 to E1) 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 (Sep 2013: 54 rules) and tested against independent sources.

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

Advanced End Users, Developers, Financial and Insurance Industry

User Interface

Console/Terminal, Web-based

Programming Language

AWK, C, Java, PHP, Perl, Ruby


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