ISBN registration group
ISBN group 978-635 — Iran
ISBNs beginning 978-635 are issued for Iran. The group identifier has 3 digits.
Registrant (publisher) ranges
| Registrant range | Registrant digits | Publication digits | Titles per registrant | Registrants in range |
|---|---|---|---|---|
| 00–04 | 2 | 4 | 10,000 | 5 |
| 0500000–2499999 | — | — | — | Not yet assigned |
| 250–324 | 3 | 3 | 1,000 | 75 |
| 3250000–5799999 | — | — | — | Not yet assigned |
| 5800–6999 | 4 | 2 | 100 | 1,200 |
| 7000000–9599999 | — | — | — | Not yet assigned |
| 96000–99999 | 5 | 1 | 10 | 4,000 |
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 978-635-. 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 2 digits, the publication element has 4 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, 6 Nov 2026 03:30:05 UTC).