Amazon Standard Identification Number Information
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ASINs were once unique worldwide, but global marketing has changed so that ASINs are only guaranteed unique within particular marketplaces.[ citation needed] Accordingly, the same product may have several ASINs, and different national sites may use a different ASIN for the same product.[ citation needed] In general, ASINs are unlikely to be different between the country sites, especially if they are for a class of product where the ASIN is based on an externally defined and internationally consistent identifier, such as ISBN for books.[ citation needed]
Each product sold on Amazon.com is given a unique ASIN. For books with 10-digit International Standard Book Number (ISBN), the ASIN and the ISBN are the same.  The Kindle edition of a book will not use its ISBN as the ASIN, although the electronic version of a book may have its own ISBN. In most cases, it is possible to convert an ASIN to obtain a corresponding EAN code, also known as an International Article Number.