Hawkynt

ISSN

ISSN (International Standard Serial Number) check digit calculation per ISO 3297. 8-digit identifier for periodical publications with modulo-11 weighted sum. Format: XXXX-XXXX where last digit is check digit (0-9 or X). Used for journals, magazines, newspapers worldwide.

Properties

Property	Value
Category	Checksums
Sub-category	Publication Identifier
Security status	🎓 Educational Only
Complexity	Beginner
Inventor	International Organization for Standardization
Year	1975
Origin	Not specified
Source	algorithms/checksum/issn-checksum.js

Security

Status: 🎓 Educational Only

No vulnerabilities are recorded for this implementation.

Notes

• Format: 8 digits, often written as XXXX-XXXX
• Position 8: Check digit (0-9 or X for 10)
• Weights: 8,7,6,5,4,3,2 (positions 1-7)
• Algorithm: Σ(digit × weight) mod 11
• Check digit: (11 - sum mod 11) mod 11, where 10 = ‘X’
• Example: ISSN 0378-5955 (Audiology journal)
• Detects: All single-digit errors
• Detects: Most transposition errors
• Used by: Libraries, databases, citation systems

Documentation

• ISSN on Wikipedia
• ISO 3297 Standard
• ISSN Portal

References

• python-stdnum ISSN implementation

Test vectors

3 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.

Vector 1 — Nature journal (0028-0836)

Field	Value
input	30303238303833
expected	06

Vector 2 — Science journal (0036-8075)

Field	Value
input	30303336383037
expected	05

Vector 3 — Library of Congress example (0317-8471)

Field	Value
input	30333137383437
expected	01

---

← All algorithms

This site is open source. Improve this page.