Might be surprising but those are not inherently unique to a product, the maker does whatever they want (if Chupa Chups decide to only ever use 100 barcodes and

Might be surprising but those are not inherently unique to a product, the maker does whatever they want (if Chupa Chups decide to only ever use 100 barcodes and recycle them across products in time, they can). And they're also not completely unique internationally but I don't remember if there are any namespaces in the first place [edit: EANs are namespaced internationally, but nothing stops a maker from putting random codes if they're not going through standard distribution.]