Why does 979 exist?
The ISBN-13 format uses EAN prefixes 978 and 979 to identify books. The 978- prefix was used exclusively from 2007 (when ISBN-13 was adopted) through the gradual rollout of new registrations. By the late 2010s, the 978 namespace began showing capacity constraints in heavily-used registration groups — particularly Group 0 (English-language), which had enormous demand.
The 979 prefix doubles the available ISBN capacity by providing an entirely new top-level namespace. The International ISBN Agency opened the 979 space systematically, starting with the 979-10 group (assigned to France) and expanding from there.
Key difference from 978
The critical distinction: 979-ISBNs have no ISBN-10 equivalent. The ISBN-10 format was derived from 978-ISBNs by stripping the "978" prefix and recalculating the check digit. Since ISBN-10 is a 10-digit format and the original EAN prefix was always assumed to be 978, there's no way to encode a 979-based ISBN-13 in the older 10-digit format.
This means: if you have a book with a 979- ISBN, you cannot convert it to ISBN-10. Any system or database that only accepts ISBN-10 will be unable to represent this book.
Which groups use 979?
The 979 space uses the same registration group system as 978, but the group numbers don't correspond — Group 979-10 is not the same as Group 978-1 (though both are France for 979-10). The groups are:
- 979-8 — Amazon Publishing / KDP self-publishing ISBNs (United States)
- 979-10 — France
- 979-11 — South Korea
- 979-12 — Italy
- Additional groups are being opened as demand grows
The 979-8 group is notable because Amazon's Kindle Direct Publishing (KDP) assigns free ISBNs to self-published authors from this range. Books self-published through KDP typically have ISBNs starting with 979-8.
How to identify a 979 ISBN
A 979-ISBN-13 will have the number 979 as its first three digits. For example: 979-8-3936-2150-4 is a KDP self-published book (group 979-8).
If you encounter a 13-digit number starting with anything other than 978 or 979, it is not a valid ISBN — it may be an EAN barcode for a different product category.
Does my system need to support 979?
If you're building a library catalog, bookstore inventory, or publishing workflow in 2024 or later: yes, you must support 979-ISBNs. The number of books published with 979- ISBNs grows every year, and the 979-8 range in particular is extremely active due to KDP self-publishing volume.
Legacy systems that were built assuming all ISBNs fit the 978 pattern (or that there's always an ISBN-10 equivalent) will need to be updated.
979-8: Amazon's self-publishing ISBN block
Amazon's KDP assigns ISBNs from the 979-8 block to books self-published through its platform. These ISBNs are free for KDP authors, which has made this range extremely high-volume. A 979-8 ISBN identifies the book as having been published through Amazon's infrastructure — which is useful context when you're researching a book's provenance.
Self-publishers who want an ISBN not tied to Amazon can purchase one from their national ISBN agency (or through Bowker in the US). These will typically be in the 978-1 or other group ranges.