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What is an Amazon FNSKU?

September 21st, 2023

In the ever-expanding world of e-commerce, Amazon reigns supreme as one of the largest and most influential marketplaces. Sellers from around the globe flock to Amazon to tap into its immense customer base. However, navigating the intricacies of Amazon’s fulfillment system can be quite challenging for newcomers. One of the crucial elements that every Amazon seller should understand is the FNSKU. In this article, we will demystify this acronym and shed light on its significance in the world of Amazon selling.

Understanding Amazon’s FNSKU

What Does FNSKU Stand For?

FNSKU stands for Fulfillment Network Stock Keeping Unit. It is a unique identifier assigned by Amazon to every product that enters its fulfillment network. This alphanumeric code distinguishes your product from others and plays a pivotal role in ensuring smooth order processing and customer satisfaction.

How is FNSKU Different from ASIN?

Amazon sellers might often confuse FNSKU with ASIN (Amazon Standard Identification Number). While both are used to identify products on Amazon, they serve different purposes. An ASIN is a unique identifier for products listed on Amazon’s marketplace, whereas an FNSKU is specific to products within Amazon’s fulfillment network.

The Importance of FNSKU

1. Inventory Management

FNSKU plays a crucial role in inventory management. When you send your products to Amazon’s fulfillment centers, they need to be labeled with their respective FNSKUs. This ensures that Amazon can track and manage your inventory accurately.

2. Order Fulfillment

When a customer places an order, Amazon’s sophisticated system uses the FNSKU to identify the exact product to be shipped. This minimizes the risk of shipping the wrong item to the customer.

3. Preventing Counterfeits

FNSKU also helps in preventing counterfeit products from entering Amazon’s supply chain. Since each product has a unique FNSKU, it becomes challenging for counterfeiters to replicate it accurately.

How to Obtain an FNSKU?

Getting an FNSKU for your products is a straightforward process. Here’s how you can obtain one:

  1. Create an Amazon Seller Account: If you haven’t already, you’ll need to set up a seller account on Amazon.
  2. List Your Product: List the product you intend to sell on Amazon’s marketplace.
  3. Choose Fulfillment by Amazon (FBA): Opt for Amazon’s FBA program, which allows Amazon to store, pack, and ship your products.
  4. Label Your Products: Amazon will provide you with the necessary FNSKU labels for your products. Ensure that each item is correctly labeled before sending them to Amazon’s fulfillment centers.
  5. Send Your Products: Ship your labeled products to the designated Amazon fulfillment center.


In the realm of Amazon selling, understanding the significance of FNSKU is paramount. It is the key to efficient inventory management, accurate order fulfillment, and safeguarding your brand against counterfeiters. As you embark on your journey as an Amazon seller, make sure to embrace FNSKU as an essential tool for success.


  1. Is an FNSKU the same as a UPC or EAN code? No, they are not the same. FNSKU is specific to Amazon’s fulfillment network, while UPC and EAN codes are universal product identifiers.
  2. Do I need an FNSKU if I’m using Amazon FBA? Yes, Amazon requires FNSKU labeling for products stored in their fulfillment centers, even if you are using FBA.
  3. Can I change an FNSKU once it’s assigned? No, FNSKUs are unique and cannot be changed. Each product variant will have its own FNSKU.
  4. Are there any fees associated with obtaining an FNSKU? Amazon typically does not charge a fee for assigning an FNSKU to your products.
  5. What happens if I don’t use an FNSKU for my Amazon FBA products? Without an FNSKU, Amazon may not be able to accurately track and fulfill your orders, which could lead to customer dissatisfaction and account issues.