GS1 is an international organisation which defines the specifications for barcodes, among other things. The agreement established between GS1 and the ISSN International Centre allows ISSN numbers to be used in barcodes according to the EAN13 specifications, with the prefix 977 reserved for serial publications.

ISNI (ISO 27729) is the certified global standard number for identifying contributors to creative works and those active in their distribution. The ISSN International Centre is a member of ISNI International Agency and as such, makes use of existing ISNI to complete ISSN records with identifiers assigned to issuing bodies for example. This practice is also extending to ISSN National Centres thus providing interoperability between ISSN and ISNI.