Wikipedia has a list of IBAN formats by country , so at least this is possible.
However, there is no complete algorithm for it - as a software developer, you can get the algorithm from this input. Please note that other countries may follow in the future, so you can expect more work (and hopefully no more exceptional cases of sort codes and accounts).
As for the tool or library, this topic is irrelevant here at StackOverflow, but you can ask for Software Recommendations . Please note that they have different requirements for how to ask questions, so you can read the tour first. Do not forget to specify the programming language.
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