European Article Number
EAN is the synonym for 8- and 13-digit barcodes that has been replaced by GTIN (Global Trade Identification Number) since 2009.
In addition to the country and reference to the manufacturer, the EAN or better: GTIN numbers contain a consecutive product number and a check digit. The numbers are issued worldwide by GS1 for a corresponding fee.
Proof GmbH is a member of GS1. (German)
An article with tips for creating GTIN numbers for graphic designers can be found here. (German)
You can search for GTIN numbers here: