How have 10-digit ISBNs been affected by the ISBN change?
All ISBN-10s officially changed to ISBN-13s on January 1, 2007. This has been accomplished by prefixing all ISBN-10s with the Bookland EAN prefix ‘978’ (not ‘979’) and recalculating the check digit.’978′ can be thought of as the area code to which all ISBN-10s belong. All ISBN-13s that begin with ‘978’ can be presumed to have corresponding ISBN-10s. This logic allows trading partners to readily translate between ISBN-10s and ISBN-13s.
