International Identifier for serials
and other continuing resources, in the electronic and print world

The ISSN International Portal




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The ISSN International Portal is published by the ISSN International Centre. It lists all ISSNs assigned to serial publications. It is the most complete reference source in the world for the identification of serial publications.

The ISSN International Portal in figures

The ISSN Network has assigned more than 2.5 million ISSN.

The database is constantly updated by the ISSN Network. It increases by approximately 50,000 to 70,000 ISSNs per year, reflecting an equivalent number of records and identified publications.

Nearly 130,000 corrections and modifications are made every year.

The Internet online version is updated continuously.

For complete information about the contents and expansion of the ISSN International Portal, view the ISSN statistics (in English):

Exhaustive data

Each bibliographical record in the ISSN International Portal contains:

  • the publication’s unique reference elements:
    • ISSN,
    • key title, and
    • abbreviated key title,
  • additional elements used to identify the publication concerned:
    • frequency,
    • language,
    • other forms of the title,
    • place of publishing,
    • publisher,
    • medium, etc.
  • where appropriate, the links associating the title concerned with other titles also identified by an ISSN:
    • previous title(s),
    • issues in other languages,
    • issues in other media, etc.

Access the ISSN International Portal

The ISSN International Portal is available online and under subscription via the ISSN Portal.

Other access modes are possible:

ISSN records are available in the following formats:

The exchange format is ISO 2709.

The tables indicate the MARC 21 and UNIMARC fields required to create ISSN records.


What is MARC?
MARC is the bibliographic format used by libraries.