| well-formed | ||
| no hyphens provided | ||
| ISBN-10 | 964-8944-38-5 | 9648944385 |
| ISBN-13 | 978-964-8944-38-9 | 9789648944389 |
| Agency | Iran | |
| Publisher | Tandis | |
| well-formed | ||
| valid hyphenation | ||
| ISBN-10 | 600-182-212-3 | 6001822123 |
| ISBN-13 | 978-600-182-212-4 | 9786001822124 |
| Agency | Iran | |
| Publisher | Tandis | |
| well-formed | ||
| no hyphens provided | ||
| ISBN-10 | 964-8944-39-3 | 9648944393 |
| ISBN-13 | 978-964-8944-39-6 | 9789648944396 |
| Agency | Iran | |
| Publisher | Tandis | |
| not well-formed | |||||||||
| ignored hyphens | |||||||||
| This might be a well-formed ISBN-13, but its check-digit is missing. The correct check digit would be: 9. | |||||||||
| Hyphenation provided ("978-600-182-40-2") is implausible so ignored it. | |||||||||
| Correcting check-digit gives: 978-600-182-402-9 which appears to be valid. The governing agency is: Iran. | |||||||||
| well-formed | ||
| valid hyphenation | ||
| ISBN-10 | 964-8944-40-7 | 9648944407 |
| ISBN-13 | 978-964-8944-40-2 | 9789648944402 |
| Agency | Iran | |
| Publisher | Tandis | |