FBA FNSKU stickers
What Is an FNSKU on Amazon and Why Your Units Need One
FNSKU stands for Fulfillment Network Stock Keeping Unit. It is the identifier Amazon uses inside its warehouses to know that a specific unit belongs to you.
Understanding it prevents receiving problems and mixed-up inventory.
FNSKU vs ASIN vs SKU vs EAN
- ASIN – Amazon’s product identifier, the same for every seller of that product.
- SKU – your own internal code for the product.
- EAN/UPC – the manufacturer barcode, often printed on packaging.
- FNSKU – identifies your units of that product in Amazon’s fulfilment network.
When you need FNSKU labels
If your units are tracked as seller-specific inventory, each one needs an FNSKU label. Products that qualify for manufacturer-barcode tracking may not need them; check the setting for each listing in Seller Central.
Example
If you and another seller both sell the same branded item, the ASIN is shared but each seller has a different FNSKU. When stock is received, Amazon scans the FNSKU to know the units belong to you, so returns and sales are credited to the right seller.
Where FNSKU labels go
Stick one label on each unit, on a flat surface, covering any other barcode such as the EAN or UPC. The fulfilment centre should only be able to scan your FNSKU, otherwise units may be received incorrectly.
Printing them
Copy the FNSKU from Seller Central and print as many labels as you have units with the FBA FNSKU sticker generator. Thermal printers give the cleanest, most durable barcodes.
Frequently asked questions
Is FNSKU the same for all sellers?
No, each seller gets their own FNSKU for the same ASIN.
Where do I find my FNSKU?
In Seller Central inventory or shipment pages.
Can I reuse FNSKU labels?
Each physical unit needs its own label.
Does every FBA product need an FNSKU label?
Most do, unless the product is eligible for manufacturer barcode tracking; check Seller Central.