Formally, the general form of the ISSN code (also named 'ISSN structure' or 'ISSN syntax') can be expressed as follows: įor calculations, an upper case X in the check digit position indicates a check digit of 10 (like a Roman ten).

The last code digit, which may be 0-9 or an X, is a check digit.

As an integer number, it can be represented by the first seven digits. The format of the ISSN is an eight-digit code, divided by a hyphen into two four-digit numbers. Consequently, as defined in ISO 3297:2007, every serial in the ISSN system is also assigned a linking ISSN ( ISSN-L), typically the same as the ISSN assigned to the serial in its first published medium, which links together all ISSNs assigned to the serial in every medium.

The ISSN system refers to these types as print ISSN ( p-ISSN) and electronic ISSN ( e-ISSN). For example, many serials are published both in print and electronic media. When a serial with the same content is published in more than one media type, a different ISSN is assigned to each media type. ISO subcommittee TC 46/SC 9 is responsible for maintaining the standard. The ISSN system was first drafted as an International Organization for Standardization (ISO) international standard in 1971 and published as ISO 3297 in 1975. ISSNs are used in ordering, cataloging, interlibrary loans, and other practices in connection with serial literature.

The ISSN is especially helpful in distinguishing between serials with the same title. ISSN expanded with sequence variant 0 to a GTIN-13 and encoded in an EAN-13 barcode with an EAN-2 add-on designating issue number 13Īn International Standard Serial Number ( ISSN) is an eight-digit serial number used to uniquely identify a serial publication, such as a magazine.

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