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.
#NATIONAL RESOPHONIC SERIAL NUMBERS SERIAL NUMBER#
ISSN-615-682536 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.