What do the unique identifiers in Amazon mean?

Amazon uses different unique identifiers to link a product and its data. Whereas bol.com only uses the EAN and ISBN, Amazon is an international platform and therefore offers a wider range of unique identifiers.

In this article, we'll explain what all these unique identifiers mean.

GTIN means Global Trade Identification Number and is the English variant of the EAN code, or literal translation. The GTIN is therefore similar to the EAN code and has the same properties.

Unique identifier Describtion
ASIN

ASIN means Amazon Standard Identification Number. It is a number with 10 characters which consists of numbers and letters. Amazon assigns the ASIN to a product based on other identifiers such as EAN codes.

ASINs are unique within a specific marketplace. Thus, since Amazon sees each domain name - such as .nl and .com - as a different marketplace, the same products can have different ASINs. 

 EAN

The EAN code can also be found under the product's barcode. 

EAN means European Article Number. It is a number with 13 characters which consists only of numbers. The EAN code is used throughout Europe in online and offline stores to provide products with a unique code for automating cash register processing and stock administration. 
 UPC UPC means Universal Product Code. It is a 12-character number consisting only of numbers. The UPC is only used in the United States in online and offline stores to provide products with a unique code for the purpose of automating cash register processing and stock administration. 
The UPC can also be found under the barcode of the product. 
 ISBN

ISBN means International Standard Book Number and is used as a unique identifier of books. The ISBN is similar to the EAN code, but can be recognized by the fixed prefix of the numbers 978 and 979.

The ISBN can also be found under the product's barcode.

 PZN

PZN means Pharma-Zentral-Nummer and is used in Germany for the identification of medicines. The PZN consists of a prefix of PZN continued by 7 numbers. 

The PZN can also be found under the product's barcode.

 GTIN
 GCID

GCID means Global Catalog Identifier and is given to your product by Amazon to show that it is your brand. When you apply for Brand Registry, Amazon will assign the GCID number to your products. You can only use the GCID when you add a new product that is part of your approved list of registered brands.


If you are part of Amazon's brand registration program, you must rent the EAN codes directly from GS1, as Amazon compares the EAN codes to the GS1 database for brand registered sellers.

Using ASIN or EAN codes

Do you use the European Amazon marketplace? In case of an existing Amazon product, please use the ASIN and/or EAN. For a new product which is not yet known on Amazon, we recommend you use the EAN code.

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