LPN Labels: License Plate Numbers for Warehouse Tracking
LPN in logistics means License Plate Number: the unique ID assigned to a pallet, carton or tote and printed as a barcode label. Scan it once and the warehouse management system (WMS) knows what is inside and where it is.
An LPN label turns a pallet, tote or carton into something your warehouse management system can identify with a single scan. This guide explains what a License Plate Number is, how it flows through receiving, putaway, picking and shipping, and how to choose the size, material, barcode and Zebra printer that keep it scannable — from an authorized Zebra partner and WMS developer serving all of Latin America from Panama.
Free tool: LPN & SSCC label generatorBuild sequential LPN or GS1 SSCC-18 labels, preview them at true size and download ready-to-print ZPL for your Zebra printer.
Open the LPN & SSCC label generatorWhat Is an LPN Label?
LPN stands for License Plate Number — a single unique identifier assigned to a logistics unit and printed as a barcode label.
One scan, everything inside
Just as a vehicle plate identifies a car without describing it, an LPN identifies a handling unit without re-scanning its contents. The warehouse management system links that one number to everything the unit holds — items, quantities, lot or serial numbers, expiry dates and current location. Scan the LPN once and the WMS knows the rest.
Why it speeds up the floor
Without LPNs, a worker scans every carton on a pallet at each touch. With LPNs, one scan moves, picks or ships the whole unit. That is fewer keystrokes, fewer errors and faster receiving, putaway and loading — the core reason license-plating is standard practice in modern distribution centers.
Where the number comes from
The WMS generates the LPN — usually a sequential or check-digit-protected number — at the moment a unit is created: when goods are received, when a pallet is built, or when a tote starts a pick. Our own logisticaHQ WMS assigns and prints LPNs as part of the receiving and putaway flow.
How an LPN Moves Through the Warehouse
The same license plate follows a unit from the dock to the truck, gathering and surrendering information at each step.
| Stage | What the LPN does |
|---|---|
| Receiving | A new LPN is created and printed as goods arrive; the unit and its contents enter the WMS in one action. |
| Putaway | Scan the LPN, scan the bin — the system records the whole unit's location with two scans. |
| Picking & replenishment | License-plated totes and pallets move between zones without re-scanning every item, supporting cluster and batch picks. |
| Shipping | The internal LPN is reconciled and, when GS1 compliance is required, an SSCC shipping label is printed for the carrier and customer. |
Every one of those scans happens on a mobile computer. Pair LPN printing with rugged Android scanners such as the Zebra MC3400 or wearable WT6400 so the floor reads the plate the moment it is printed.
LPN vs SSCC vs SKU Label
Three labels that are easy to confuse — they answer three different questions.
| Label | Answers | Scope |
|---|---|---|
| LPN (License Plate Number) | “Which handling unit is this?” | Internal to your warehouse / WMS |
| SSCC | “Which shipping unit is this, globally?” | GS1 standard, unique worldwide |
| SKU / product label | “What product is this, and how many?” | Item level (each, case) |
The practical rule: an LPN is yours to design, an SSCC follows the GS1 rules so partners can scan it. Most operations run an internal LPN inside the four walls and print an SSCC at the point of shipment. Need to test a symbology before you commit? Use our free barcode generator to render Code 128 and GS1 codes at print resolution.
Size, Material and Barcode
An LPN that smudges, fades or is too small to scan from a forklift defeats the purpose. Three choices decide whether it survives its job.
| Use case | Typical size | Material |
|---|---|---|
| Pallet license plate (in-house) | 4 x 6 in | Direct thermal — Z-Perform 2000D |
| Tote / carton | 4 x 2 or 3 x 1 in | Direct thermal or synthetic |
| Cold storage / outdoor / long-life | 4 x 6 in | Thermal transfer on polypropylene + resin ribbon |
| Shipping (GS1 / SSCC) | 4 x 6 in | Thermal transfer, GS1-128 symbology |
Choosing between direct thermal and thermal transfer is the decision that most affects cost and durability — our label material guide works through it in detail. For the barcode itself, Code 128 handles internal LPNs; switch to GS1-128 when the plate becomes an SSCC at shipping.
Which Zebra Printer Prints Your LPN Labels?
Match the printer to volume and where the label is created. All produce crisp Code 128 and GS1-128 barcodes and accept ZPL from any WMS.
High volume — industrial
For receiving docks and pallet-building stations printing thousands of 4 x 6 plates a day, an industrial printer with 3-inch high-capacity rolls is the workhorse. Look at the Zebra ZT231 and ZT411.
Workstation — desktop
For pack benches and lower-volume zones, a desktop printer delivers the same barcode quality in a smaller footprint. The Zebra ZD621 is the standard choice.
Print at the point of work — mobile
When pallets are license-plated where they are built, a belt-worn mobile printer like the Zebra ZQ521 prints the LPN on the spot — no walking back to a station.
Driving the labels from software? NiceLabel and our own logisticaHQ both output ZPL directly to these printers. Browse the full range in the Zebra printers catalog and the media in the Zebra supplies catalog.
Ready to print your own license plates?Generate up to 100 LPN or SSCC labels at a time, with the GS1 check digit calculated for you. Free, and everything stays in your browser. Want to design the whole label layout? Try the ZPL label designer.
Open the LPN & SSCC label generatorFrequently Asked Questions
What is an LPN label?
An LPN (License Plate Number) label is a barcode label that carries a single unique identifier for a logistics unit — a pallet, tote, carton or container. Scanning that one barcode lets a warehouse management system (WMS) look up everything the unit holds: items, quantities, lot or serial numbers, and location. The number 'licenses' the contents the way a vehicle plate identifies a car.
What is the difference between an LPN and an SSCC?
An LPN is any unique ID your WMS assigns to a handling unit; its format is internal to your operation. An SSCC (Serial Shipping Container Code) is the GS1 global standard for that same job — an 18-digit number encoded in a GS1-128 barcode that is unique worldwide, so trading partners and carriers can scan it. Many warehouses use an internal LPN inside the building and print an SSCC label when a unit ships.
What barcode is used on an LPN label?
Code 128 is the most common symbology for internal LPNs because it is compact and encodes alphanumeric data reliably. When the label must follow the GS1 standard for shipping, GS1-128 (Code 128 with GS1 application identifiers) is used to encode the SSCC. 2D codes such as Data Matrix or QR are used when more data must fit in a small space.
Should LPN labels be direct thermal or thermal transfer?
Use direct thermal for short-lived license plates that stay inside the building for days or weeks — it needs no ribbon. Use thermal transfer on a synthetic label when the unit travels, sits in cold or outdoor storage, or must stay scannable for months, because the printed image resists heat, light and abrasion.
What size should an LPN label be?
A 4 x 6 inch label is the standard for pallets and large containers because the barcode and human-readable number stay scannable from a forklift. Totes and cartons commonly use 4 x 2, 3 x 1 or 2 x 1 inch labels. The right size depends on scan distance and how much human-readable text you need beside the barcode.
Set Up LPN Labeling End to End
Tell us your volumes, your unit sizes and whether you ship under GS1, and we will spec the printer, the media and the barcode — or wire LPN printing straight into your WMS. Genuine Zebra hardware and supplies shipped across Latin America from Panama, with USD quotes.