Nike SB Alleyoop Black White
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Barcode formats for 193154100815
These are the same product number written at different lengths. A shorter form is padded with leading zeros to make the longer one. The last digit is a checksum over the rest. Convert between them with the GTIN converter or verify the last digit with the check digit calculator.
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Related guides
Can a barcode tell if sneakers are real?
What a barcode lookup can and cannot tell you about sneaker authenticity, and how to use it as one signal among several.
UPC vs EAN vs GTIN: what is the difference
UPC is not an alternative to GTIN. A UPC-A barcode carries a 12-digit GTIN-12, so UPC is one member of the wider GTIN family.
Why a barcode gets an “Invalid prefix/type combination” error
This validation error means the selected barcode type does not fit the prefix the validator detected. Check the format selection before recalculating the check digit.