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GlossaryIdentifiers

ASIN

Also known as: Amazon Standard Identification Number

Amazon's unique 10-character product identifier, present in every listing URL and used by every Amazon API.

ASIN (Amazon Standard Identification Number) is the 10-character alphanumeric identifier Amazon assigns to every product in its catalog. It's the primary key for every product, listing, review, and report. You can find an ASIN in any product URL after the /dp/ segment: https://www.amazon.com/dp/B07X7DJ8WK → ASIN is B07X7DJ8WK.

For books, the ASIN is the same as the ISBN-10. For other products, Amazon generates the ASIN when the listing is first created. A single product can have multiple ASINs across marketplaces (US, UK, DE, JP all assign their own), and variations of the same product (different size or color) each have their own ASIN under a parent ASIN.

Don't confuse ASIN with FNSKU or UPC. ASIN identifies the LISTING. UPC identifies the manufacturer's product. FNSKU identifies a specific SKU within YOUR Amazon FBA inventory — same ASIN, different sellers, different FNSKUs.

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Related terms

FNSKU

The Amazon-issued barcode that uniquely identifies your specific units of a SKU within Amazon's fulfillment network.

UPC

A UPC (Universal Product Code) is the 12-digit barcode standard used in North America to identify retail products, required as a product identifier when creating most Amazon listings.

Parent ASIN

A "container" ASIN that groups variations (size, color, flavor) of the same product into a single listing.

EAN

An EAN (European/International Article Number) is the 13-digit barcode standard used outside North America, functionally the international counterpart to the 12-digit UPC.