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Everything You Need to Know About Amazon’s FBA Business Using FNSKU in 2023

Fulfillment Network Stock Keeping Units are referred to as FNSKUs. Amazon uses this barcode to keep track of items as they move between warehouses.

The same product may be sold by many vendors, leading to confusion if no distinguishing characteristics are assigned to each item. FNSKUs enable differentiation between these items and real-time inventory monitoring.

FBA, FBM, SKU, ASIN, and FNSKU are just some of the acronyms that new Amazon sellers may hear. It’s easy to get lost! The FNSKU is a common stumbling block for vendors. Please explain. Is a FNSKU required? How can I apply for a FNSKU? The FNSKU barcode and how to make one are discussed further below. It’s common for Amazon sellers to feel lost among all the jargon and acronyms. Creating an Amazon product listing is challenging enough without having to learn these words. What’s the difference between an ASIN, UPC, and FNSKU? What’s the point of studying so many unfamiliar concepts? Most retailers see these identifiers as interchangeable because they believe they all refer to the same thing.

 This, however, could not be farther from the truth. Amazon FNSKUs have nothing in common with ASINs or UPCs. It’s a special number that lets Amazon FBA vendors track individual items. 

In this post, I’d want to talk about the FNSKU, why it’s useful, and how to put it to work.

  • An FNSKU is…
  • Which is better, ASIN or FNSKU, and why?
  • What is the difference between a UPC and a FNSKU?
  • Does your Amazon product need a FNSKU?
  • Methods for Developing a FNSKU
  • How to Include a FNSKU Barcode on Product Labels
  • Conclusion

An FNSKU is…

A Fulfillment by Amazon (FBA) vendor will utilize a barcode known as a Fulfillment Network Stock Keeping Unit (FNSKU). The FNSKU (or Amazon barcode) is a unique identifier for your items that Amazon uses to link them to your Amazon Seller account. 

Each product must have the FNSKU barcode attached if you want to use Amazon’s Fulfillment Services. For better inventory management and to avoid confusion with other sellers, Amazon recommends using the FNSKU barcode instead of the UPC barcode. 

During Amazon’s fulfillment process, the FNSKU barcode will be used to verify that the proper goods was received and the correct seller was given credit for the transaction. 

The barcodes used to keep track of inventory and link a product to a seller are known as Fulfillment Network Stock Keeping Units (FNSKUs), a name exclusive to Amazon. In case you haven’t heard of FNSKUs before, they’re utilized in the fulfillment process. 

Which is better, ASIN or FNSKU, and why?

The ASIN (Amazon Standard Identification Number) and the FNSKU (Full National Stock Keeping Unit) are often misunderstood by consumers. The ASIN is a unique identifier for each product sold on Amazon. 

The ASIN may be found on every given product’s detail page. 

An ASIN is associated with a single product, whereas a FNSKU is associated with a single vendor. With the FNSKU, you can identify your goods and claim ownership on Amazon. Basically, the ASIN is essentially a product identifier.

What is the difference between a UPC and a FNSKU?

In the same way that a FNSKU describes what a product is, a UPC (universal product code) does the same. A universal product code (UPC) can be used across all retail and e-commerce platforms, but a FNSKU can only be used on Amazon. 

If you’re doing retail arbitrage or wholesale on ASINs with numerous sellers, the FNSKU barcode on each item is a must. 

Using the UPC barcode alone when sending items to FBA means that your stock will be combined with that of other sellers. If you sell on the same ASIN as another seller, but use the FNSKU barcode instead, Amazon will keep your stock separate. 

Does your Amazon product need a FNSKU?

Does your product need to have a FNSKU barcode in order to be sold on Amazon? It’s hard to say. 

Amazon will inquire whether you’d want to use the manufacturer barcode (UPC) or an Amazon barcode when adding a product to your inventory. The usage of the Amazon barcode may be mandatory in specific situations.

The Amazon barcode (FNSKU) is highly recommended for use at all times since it simplifies inventory management. 

Methods for Developing a FNSKU

If you are an Amazon seller and you have enabled Amazon barcoding for your FBA inventory, then each individual item will have its unique FNSKU. No FNSKU will be assigned to any listings that are FBM (fulfilled by merchant). 

Go to Manage Inventory and make sure the “FNSKU” column is selected under preferences to see the FNSKU for your product. 

How to Include a FNSKU Barcode on Product Labels

If you have the Amazon barcode enabled or if Amazon needs it for your goods, each unit must be tagged with the FNSKU barcode before Amazon can make your inventory active. 

Either you or your supplier can apply labels (or have your FNSKU barcode printed on the packaging) or you may pay Amazon to do it for you.Labels for products may be printed by selecting them in Manage Inventory. Find the edit button on the right, and then use the arrow down next to it to choose “Print item labels.”


Therefore, it is the case. That wraps up my comprehensive guide to FNSKU labels on Amazon. 

Please think about switching to FNSKU labels in the future. FBA vendors are obligated to offer their wares a distinct label to prevent counterfeiting. More crucially, dishonest vendors will rethink replicating your goods. Hopefully, you now know how to distinguish between the various product designations. When compared to the Amazon ASIN and the UPC, the FNSKU may be thought of as a product + seller identification. To avoid confusion during the shipping and delivery process, you should begin utilizing Amazon FNSKU.

Help with product input and listing data is always accessible with SAECOM FBA PRO. Now is the time to hire us so that we can set ourselves apart and increase our market share.


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