ISBN registration group
ISBN group 978-972 — Portugal
ISBNs beginning 978-972 are issued for Portugal. The group identifier has 3 digits.
Registrant (publisher) ranges
| Registrant range | Registrant digits | Publication digits | Titles per registrant | Registrants in range |
|---|---|---|---|---|
| 0–1 | 1 | 5 | 100,000 | 2 |
| 20–54 | 2 | 4 | 10,000 | 35 |
| 550–799 | 3 | 3 | 1,000 | 250 |
| 8000–9499 | 4 | 2 | 100 | 1,500 |
| 95000–99999 | 5 | 1 | 10 | 5,000 |
Shorter registrant numbers are issued to larger publishers (more publication digits = more titles).
Reading an ISBN from this group
Every ISBN in this group starts 978-972-. The next digits are the registrant; look up which range the following seven digits fall into to know how long the registrant element is. For example, if the registrant has 1 digits, the publication element has 5 digits, then comes the check digit.
Check, convert or hyphenate any ISBN with the ISBN converter, and make a print-ready barcode with the ISBN barcode generator.
Sources & data
- International ISBN Agency RangeMessage (Fri, 2 Oct 2026 16:08:21 UTC).