ABA Routing Number Checksum Explained for Developers
ABA routing numbers explained: what each of the nine digits means, how the 3-7-1 checksum works and how to validate ACH and payroll forms in your code.
Category: Developer & Security
How to Decode a VIN: What All 17 Characters Mean
How to decode a VIN: what the manufacturer code, model year letter, plant code and check digit mean, plus a quick way to verify a VIN by hand.
ISBN-13 Check Digit Explained, With Worked Examples
ISBN-13 check digits explained with worked examples: what each part of a book number means, how to convert ISBN-10 to ISBN-13 and how to validate both.
EAN vs UPC Barcodes: Differences Explained Simply
EAN vs UPC barcodes explained: how EAN-13, UPC-A and EAN-8 differ, what the prefix really means and how the check digit is calculated, with examples.
License Plate Formats Around the World, Explained
License plate formats around the world explained: how plates in the UK, Germany, France, Italy, Spain, India and Brazil are built, plus fun plate games.
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