ASIN (Amazon Standard Identification Number) is the unique identifier Amazon assigns to every product listed in its catalogue. It is a 10-character alphanumeric code (e.g., B0CXYZ1234) that Amazon uses internally to track, index, and manage products.
How ASINs Work
Every product page on Amazon corresponds to one ASIN. If multiple sellers list the same product, they all sell on the same ASIN — they share the product detail page but compete for the Buy Box.
Books use their ISBN as their ASIN. All other products receive a system-generated ASIN when first listed.
Parent vs. Child ASINs
When a product has variations (size, colour, style), Amazon uses a parent-child ASIN structure:
- Parent ASIN: A non-buyable, organisational node that groups variations together
- Child ASINs: Each individual variation (e.g., "Blue, Size M") has its own unique child ASIN
This structure allows reviews to aggregate at the parent level, benefiting all variations simultaneously.
Finding an ASIN
The ASIN appears in the product URL on Amazon.com after /dp/ — for example: amazon.com/dp/B0CXYZ1234. It is also listed on the product detail page under "Additional Information."
Why ASINs Matter for Sellers
- Listing creation: You either create a new ASIN (for products not yet on Amazon) or match to an existing ASIN
- Suppression: Amazon can suppress (hide) an ASIN from search if the listing violates policy or has missing required attributes
- PPC targeting: You can target competitor ASINs directly in Sponsored Display and Sponsored Products (ASIN targeting)
- Catalogue management: All inventory, pricing, and ad operations reference the ASIN