Overview#International Standard Book Number (ISBN) is a uniqueab numeric commercial book identifier.
International Standard Book Number is assigned to each edition and variation (except reprintings) of a book. For example, an ebook, a paperback, and a hardcover edition of the same book would each have a different ISBN.
International Standard Book Number is 13 digits long if assigned on or after 1 January 2007, and 10 digits long if assigned before 2007.
An International Standard Book Number consists of 4 parts (if it is a 10 digit ISBN) or 5 parts (for a 13 digit ISBN). The parts of a 10-digit ISBN and the corresponding EAN‑13 and barcode. Note the different check digits in each. The part of the EAN‑13 labeled "EAN" is the Bookland country code.
- for a 13-digit ISBN, a prefix element – a GS1 Company Prefix: so far 978 or 979 have been made available by GS1
- the registration group element (language-sharing country group, individual country or territory)
- the registrant element
- the publication element
- Check Digit