SSCC (Serial Shipping Container Code)
The GS1 18-digit logistics-unit identifier (pallets, cartons): extension digit + GS1 company prefix + serial + mod-10 check digit (alternating 3/1 weights from the right). Used on SSCC labels and in EPCIS events; TrackJet validates the check digit locally.
Try it — live validator
Runs the same algorithm TrackJet’s detector uses, locally in your browser. Zero network calls.