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A tracking number is the unique code printed on a shipping label that links a parcel to its scan history. Each scan records where the parcel was and when, so sender and recipient can follow its journey without seeing its exact live location.
There is no single world format, and that surprises people. A Canada Post tracking number is usually a long string of digits, while a US carrier's code may mix letters and digits, and an international parcel may carry a code ending in the two-letter code of the sending country. The format itself tells you which carrier system issued it, which is why a tracking page from one carrier often refuses a number from another. The barcode printed beside the number is the same code in machine-readable form: scanners read the barcode, humans read the digits, and both point at the same record.
A scan is a checkpoint, not a live GPS ping. When a parcel passes a scanner at acceptance, at a sorting plant, on loading, or at delivery, the system records the place, the time, and the event type. Between scans, the parcel is in a truck, a plane, or a sorting bin, and the tracking page simply shows the last checkpoint until the next one appears. That is why a parcel can look frozen for a day or more while it is actually moving: long legs between facilities produce no scans. A first scan also matters more than people think. Until the carrier scans acceptance, the tracking record may show nothing at all, even though the label already exists.
| Scan event | What it actually means |
|---|---|
| Label created / information received | The label was printed; the carrier may not have the parcel yet |
| Accepted / picked up | The carrier has the parcel and the clock is running |
| In transit / departed facility | The parcel left one facility toward the next |
| Out for delivery | The parcel is on the local delivery vehicle |
| Delivered | Handed over, left at the address, or held per instructions |
| Delivery attempted / notice left | Nobody could take it; a pickup or redelivery step follows |
Tracking proves movement through the carrier's system, not the contents of the box, and that distinction matters in disputes. A "delivered" scan says the carrier's record shows delivery to the address or the pickup point, not that the right person opened the right item. It also does not prove the parcel is undamaged: a crushed box can scan cleanly at every checkpoint. If a parcel shows as delivered but is not in hand, check porches, mailrooms, neighbours, and pickup notices first, then contact the carrier promptly, since investigation windows close. Keep the label photo and the drop-off receipt: they tie your parcel to the number if the label itself is damaged in transit.
Several ordinary causes look like a lost parcel. A label can be scuffed so a later scanner misreads it, and the parcel then travels under a manual sort with no new scans until delivery. Cross-border parcels hand off between carriers, and the second carrier's scans may not feed back to the first carrier's page, so the trail goes quiet at the border. Rural routes and remote destinations have fewer facilities, so longer gaps between scans are normal there. Weather, holiday volume, and a missed connection can also stall the trail. A gap of a few days on a long route is common; a gap that stretches past the expected window is the point to open a carrier inquiry.
A seller's order number, a return authorization code, or a customs form number are not tracking numbers, even when they appear on the same box. Only the carrier's code pulls up scan events on the carrier's tracking page. That is why pasting an order number into a carrier site returns nothing: the two systems never shared that code. When a seller or a return label gives you a number, check whether it sits beside a barcode on the label itself. If it does, it is almost certainly the tracking number. In Canada, a LetterAgent shipping label is a Canada Post Xpresspost label, so its tracking number works in Canada Post's tracking tool, and the label covers parcels up to five kilograms within Canada.
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