{"@context":"https://schema.org","@type":"DefinedTerm","name":"Check digit","description":"A digit computed from the rest of an identifier that catches transcription errors before any lookup runs. Each standard has its own rule: ISO 6346 uses mod-11 with letter values, UPU S10 a weighted mod-11 with special 10\u21920/11\u21925 rules, SSCC the GS1 mod-10, IMO a 7..2 weighted sum, IATA AWB a plain mod 7. TrackJet implements all five itself and validates locally.","inDefinedTermSet":"https://trackjet.world/glossary"} Skip to content
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Check digit

A digit computed from the rest of an identifier that catches transcription errors before any lookup runs. Each standard has its own rule: ISO 6346 uses mod-11 with letter values, UPU S10 a weighted mod-11 with special 10→0/11→5 rules, SSCC the GS1 mod-10, IMO a 7..2 weighted sum, IATA AWB a plain mod 7. TrackJet implements all five itself and validates locally.

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