Serial number tracking

How serial number tracking works

Each unit carries a serial number printed by the manufacturer, usually as a barcode on the unit and on its box. The warehouse scans that serial at every step where the unit changes hands.

Say you receive 50 wireless routers. At receiving, each serial is scanned, so the system knows exactly which 50 units are in stock rather than just a count of 50. When an order ships, the packer scans the serial of the router going into the box, and the shipment records it. Months later, a customer returns a router. Scanning its serial shows which order it left on, when, and whether it is still within its warranty or return window.

When you need serial number tracking

Serial tracking adds a scan per unit, so it pays off where individual units matter.

• Warranties and repairs: you need proof of which unit was sold and when.
• High-value goods: phones, laptops, power tools and equipment where one lost unit is expensive.
• Returns fraud: a customer returning a different, older unit is caught when the serial doesn't match the order.
• Regulated or safety-critical parts, where the operation has to confirm its own traceability requirements.

Serial tracking vs lot tracking

Lot tracking follows a batch. It tells you that 200 bottles came from one production run. Serial tracking follows one unit. It is heavier to operate, because every unit has to be scanned, but it answers questions about a single item. Some products need both: a batch of batteries may carry a lot number for recalls and a serial per pack for warranty claims.

Common serial tracking mistakes

Most errors come from gaps in the scanning chain.

• Capturing serials only at shipping, so you can't prove a unit was ever received.
• Scanning the wrong barcode on a box that carries a model number, a GTIN and a serial side by side.
• Typing serials by hand, which invites transposed characters.
• Accepting the same serial twice without a warning.

How NextStock handles serial numbers

NextStock captures serial numbers at receiving, including from GS1 barcodes that carry a serial application identifier, and packing is scan-verified. Returns are graded at the unit level through a return merchandise authorization, so each returned unit gets its own disposition. See serial number tracking for details, and the electronics page for how it fits a typical electronics operation.