Real example
B08N5WRWNW is the ASIN for the Echo Dot (4th Gen). That code works on Amazon.com, Amazon.co.uk, and Amazon.de. It doesn't work at a grocery store checkout, on eBay, or in any non-Amazon system — it's Amazon's private product ID.
How an ASIN is used in e-commerce
- Amazon assigns an ASIN automatically when a new product listing is created.
- Adding a product to your Amazon cart, watching its price, or tracking it in a third-party tool all use the ASIN.
- Sellers creating bundled or new products get a new ASIN — and need a UPC to create that listing in the first place.
- Amazon's API (used by third-party tools) references products by ASIN, not UPC.
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