Serial number tracking is the practice of assigning a unique identifier to each individual item in your inventory so you can trace its complete history — from production through sale, warranty service, and beyond.
To implement it, you assign a distinct serial number to every unit, then record each movement and transaction against that number in your inventory system. (Pennlago)
Here's how the process works and why it's essential for growing manufacturers.
Serial number tracking of inventory is a technique that helps businesses monitor every individual unit, but manual tracking can lead to mistakes. Using a dedicated inventory management system empowers you to meet your customers' needs with fewer errors. The right system lets you capture data at receiving and track it again when products ship out the door.
Let's look at how serial number tracking works, why it matters, and how to set up a tracking system that fits your operation.
What is a serial number?
A serial number is a unique code assigned to a single product or component. It can be purely numeric, or it can include letters and symbols. The key distinction is that each serial number matches exactly one item — no two products share the same serial number.
Serial numbers are typically generated in sequence and contain embedded information. That information might include where the product was manufactured, when it was made, and other data useful throughout the product's life cycle. (Umich)
For example, every smartphone has a unique IMEI code, and every car has a unique VIN (Vehicle Identification Number). Both are serial numbers.
How long are serial numbers?
Serial number length varies by industry and manufacturer. There's no universal standard. A VIN is always 17 characters. An IMEI code is 15 digits. A laptop serial number might be 10–12 alphanumeric characters. The length depends on how much information the manufacturer encodes — such as factory location, production date, and product line — and how many unique items they need to identify. (Reddit)
With a serial tracking system in place, keeping an accurate account of your inventory becomes much more manageable.
How does serial number tracking of inventory work?
The manufacturer of a product creates the serial number. The goal is to make sure every item's history can be traced through the supply chain and between end users.
This process would be more straightforward if all manufacturers had control over every part of the supply chain — distribution, warehousing, and retailing. All divisions within a company would use the same systems, and the item's serial number would be captured at each stage of production.
However, most companies don't choose to integrate vertically. Vertical integration can be beneficial, but it's hard to implement and difficult to change later. Most companies partner with other businesses in their supply chain to get value from their products instead.
This means your business partners — warehouses, distributors, and retailers — also need a system to track serial numbers accurately. Without that shared traceability, handling recalls, warranty claims, or theft recovery becomes expensive and unreliable.
How to track a serial number
Tracking a serial number through your supply chain follows a consistent pattern:
Assign the serial number — Generate or import the serial number when the item is manufactured or received. You can assign numbers individually, in bulk, or by importing from a spreadsheet.
Capture at receiving — Scan or enter the serial number when inventory arrives at your facility. This creates the first record in your system.
Record during production — If the serialized item is a component, log it against the work order or BOM where it's consumed. This links the component to the finished product.
Track at shipping — Scan the serial number when the item ships to a customer. This closes the loop and ties the unit to a specific sales order.
Maintain post-sale records — Use the serial number for warranty registration, service requests, returns, and recall management.
The most effective way to handle this is with a manufacturing ERP that ties serial numbers to every stage — receiving, production, shipping, and after-sales.
Serial number vs. lot number vs. SKU vs. barcode
Serial numbers, lot numbers, barcodes, and SKUs are related but serve different purposes. Here's how they compare:
| Identifier | What it identifies | Unique to | Example |
|---|---|---|---|
| Serial number | One individual item | A single unit | IMEI: 354678091234560 |
| Lot number | A batch of items made together | A production batch | LOT-2025-0117 |
| SKU | A product type or variant | A product category | SKU-TSHIRT-BLU-L |
| Barcode | Machine-readable version of any code | Depends on the code encoded | EAN-13: 5901234123457 |
Lot numbers
Lot numbers are unique identification codes assigned to a specific batch or group of items. They tell you when a batch was made, where it was made, and what ingredients or materials were used. But a lot number doesn't identify individual items within the batch.
Lot numbers can be assigned when items are purchased or when they're manufactured. They're especially important in food and beverage, cosmetics, and supplement manufacturing, where batch-level traceability is required for compliance.
Further reading: Everything you need to know about lot numbers
Serial numbers
Serial numbers are permanently assigned to each item individually. Even if two items are identical and were made at the same time, their serial numbers will differ.
This is especially useful for high-value or complex products. IMEI codes identify smartphones. VIN codes identify automobiles. Most manufacturers use software that connects serial numbers with production data so every product can be traced back to when and how it was made.
A good manufacturing ERP lets you assign serial numbers manually, import them from external sources, or generate them automatically as part of the manufacturing process.
SKU — Stock Keeping Unit
A stock-keeping unit (SKU) is an identification code that helps store owners and manufacturers keep track of product types. SKUs differ from serial and lot numbers because they identify a product category, not an individual item.
For example, all smartphones of the same model and color share the same SKU, but each one has a unique IMEI code (serial number). Most businesses create their own SKUs using an internal naming convention.
Further reading: How to create SKU numbers
Barcodes
A barcode is a machine-readable representation of numbers and letters — the stripes you see on product packaging. A scanner reads the pattern of bars and spaces to pull up the associated data.
Barcodes can encode serial numbers, SKUs, lot numbers, or other identifiers. Standard formats include EAN (13 digits, used internationally) and UPC (12 digits, common in North America). You need to follow these standards to trade domestically and internationally. (Mecalux)
Want real-time visibility into every SKU? See how Brahmin tracks inventory across all your channels →
Why is serial number tracking important?
Although some companies are required by law to use serial numbers — vehicle part makers and medical device manufacturers, for example — any company that manufactures or distributes physical products can benefit.
A serial number tracking system helps your business run more smoothly. Your team makes fewer mistakes. Stocking and shipping become faster because you can always locate the exact item you need.
Keeping a clear record of every individual product also gives you a complete, accurate history you can access from anywhere. You'll spot patterns, forecast future demand, and stay ahead of problems before they become expensive.
Five reasons to have a serial number tracking system
1. Product recall management
Imagine you manufacture products in different factories around the world. You receive returns because a specific component is causing fires. You investigate and find that six suppliers provided that part — but only one shipped defective units.
Without serial number tracking, you might have to recall every product you've sold. That's enormously expensive. With serial numbers, you can isolate exactly which units contain the defective part, recall only those, and save significant time and money.
2. Regulatory compliance
Some industries require serial numbers by law. Every car must have a VIN that encodes where and when it was made. Every firearm sold in the U.S. must be stamped with a serial number. Medical devices (Herdemlaw) require unique device identification (UDI) under FDA rules. (Ecfr)
Even if your industry doesn't legally mandate serial tracking, having it in place makes audits and inspections dramatically easier.
3. Better after-sales service
Serial number tracking improves warranties, repairs, and after-sales service — especially for complex products with multiple components.
Consider the automotive industry: a 2024 model year car might have different window seals, airbags, and stereo connectors than the 2023 version, even though it carries the same model name. Serial tracking lets you match the correct replacement part to the right unit during maintenance or repairs.
The same principle applies to electronics, appliances, and industrial equipment. If a customer calls for help, you look up the serial number and immediately know what they have, when it was made, and what parts are inside.
4. Theft protection
If police recover a stolen item with a registered serial number, they can return it to the rightful owner. A digital version of this — like a Media Access Control (MAC) address — can flag when a stolen device connects to the internet.
For your customers, knowing that their purchase is serialized and registered adds a layer of confidence.
5. Tighter inventory control
Serial number tracking makes stock management significantly easier. When you track inventory down to the individual component level, you save time on counts, reduce shrinkage, and manage quality more effectively. This is especially true for products with multiple high-value components.
For a deeper dive on inventory practices, see 10 great ways to improve inventory control.
Benefits of serial number tracking for inventory
Complete and accurate history
Serial numbers let you trace every individual part or product from creation to current status. This is a major advantage for any business that uses historical data for forecasting or needs to manage product recalls.
Reduced data entry and errors
When every product has a unique identifier, you eliminate guesswork. Scanning a serial number is faster and more accurate than manually entering product descriptions, which reduces errors across receiving, production, and shipping.
Better goods-in-process tracking
For companies making apparel, furniture, or assembled goods, serial number tracking follows items from the start of manufacturing to the finished product. This supports techniques like Just-In-Time (JIT) production, which depends on moving or ordering components at precisely the right moment.
If you use production planning software, serial tracking integrates naturally with your work orders and production schedules.
Easier warranty and repair management
Products like cell phones, laptops, and medical devices often come with warranties. Serial numbers tie each unit to its purchase date, so you can instantly verify whether a warranty is still active. This makes repair decisions faster and prevents costly errors — like honoring an expired warranty or denying a valid one.
Proof of ownership and theft prevention
Serial numbers are unique identifiers that can prove ownership if a product is lost or stolen. Retailers and manufacturers both benefit from this: when a stolen laptop is recovered, the serial number traces it back to its origin and owner.
Legal compliance
Providing serial and lot numbers may be required in your industry. This is common for pharmaceuticals, medical supplies, firearms, and food products (where lot numbers include expiration dates and origin data). Many retailers also require serial numbers on high-value items for consumer safety.
Improved accuracy across operations
Serial numbers help you track when products were made, shipped, and received. They also let you monitor expiration dates and shelf life, reducing waste from spoiled or outdated inventory.
Beyond that, serial numbers make it easier to identify service issues, product defects, and quality patterns — giving you better data for reporting and continuous improvement.
Ready to get your inventory under control?
Real-time stock levels, automatic reorder points, and multi-warehouse tracking — all in one place.
Join 300+ manufacturers already using Brahmin
Which industries benefit most from serial number tracking?
Some industries depend on serial number tracking more than others. For these companies, telling the difference between individual units based on their histories is essential for customer service, compliance, and protecting the value of the business.
Electronics
Serial numbers are critical in the electronics industry. They help manufacturers and distributors track down products that need repair and identify which specific component is causing a problem.
For example, if a flat-screen TV is malfunctioning, the issue might not be the television manufacturer's fault — it could trace back to a defective LED panel from a specific supplier. Serial numbers make that investigation possible.
Serial tracking also protects warranty revenue. Without it, companies risk providing free service on products with expired warranties — or frustrating customers by refusing to help with valid ones.
Automotive
Traceability is essential in the automotive supply chain. Everyone downstream needs to know where a car's parts came from and how they were assembled.
The automotive sector often relies on thousands of component parts, many sourced from external suppliers. Those suppliers need robust serial tracking to serve automotive customers and maintain compliance with industry standards.
Medical devices
The FDA requires unique device identification (UDI) for (FDA)medical devices. Serial number tracking ensures that every unit can be traced from manufacturing through to the patient, supporting recall management, adverse event reporting, and regulatory audits.
Serial number tracking software for manufacturing
You need a system that tells you how much inventory you have, where it is, and what's happening with it. Trying to manage serial numbers manually — with spreadsheets or paper logs — gets confusing fast and leads to errors that are expensive to fix.
Modern MRP systems are more affordable than ever and cater to growing manufacturers. This means end-to-end traceability, including serial number tracking, is possible for manufacturers of any size.
Here's what to look for in serial number tracking software:
Status visibility — Can you see whether a serialized item is planned, received, consumed in manufacturing, booked to a work order, shipped, or written off?
Flexible assignment — Can you assign serial numbers individually, in bulk, or by importing from a CSV file?
Barcode integration — Does the system support scanning so you don't have to type serial numbers manually?
Recall and RMA support — Can you trace a defective item back to its production batch and supplier?
Compliance features — Does the system support quality control, version control, and audit trails?
Sources
How Brahmin Solutions helps with serial number tracking
Brahmin Solutions is a cloud-based manufacturing platform built for growing manufacturers doing $500K–$50M in revenue. It includes built-in serial tracking that ties into inventory, production, purchasing, and quality management — so you get end-to-end traceability without the cost or complexity of enterprise ERP. (Softwareadvice)
If you're looking for a system that handles serial numbers alongside lot tracking, BOMs, and production planning, book a demo and see how it fits your operation.
Frequently asked questions
How do you track a serial number?
You track a serial number by recording it at each stage of the supply chain — receiving, production, shipping, and after-sales. Most manufacturers use inventory management or ERP software to scan and log serial numbers automatically, creating a complete history for every individual item.
What is the difference between a serial number and a lot number?
A serial number identifies one individual item. A lot number identifies a batch of items produced together. Two items from the same lot share the same lot number but have different serial numbers. Lot numbers are common in food and pharmaceutical manufacturing, while serial numbers are standard for electronics, automotive parts, and medical devices.
What is a serial number tracking system?
A serial number tracking system is software that records, stores, and retrieves the unique serial numbers assigned to individual products or components. It lets you trace an item's complete journey — from manufacturing through sale and after-sales service — and supports recalls, warranty management, and compliance.
Can you track a product by its serial number?
Yes. If the manufacturer or retailer has recorded the serial number in their system, they can look up the product's full history — including when it was made, where it was shipped, and whether it's under warranty. This is how manufacturers manage recalls and how law enforcement returns stolen property to its owner.
About the author
Brahm Meka is Founder & CEO at Brahmin Solutions.
