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OCLC Support

About Z39.50 Cataloging

Discover the features and requirements of the OCLC Z39.50 Cataloging service.


With the OCLC Z39.50 Cataloging service, libraries access WorldCat to search and retrieve MARC records for cataloging, edit records in their local systems, and set holding information in WorldCat. This service is available to libraries who have a cataloging subscription. If your library does not have a cataloging subscription, take the first step today to learn more.


  • Search and retrieve OCLC-MARC records in WorldCat for cataloging
  • Search and retrieve LC Names and Subjects authority file records
  • Edit records in your local system
  • Set holdings information on WorldCat online via Z39.50, or through WorldCat data sync collections
  • Customized local displays defined by your local Z39.50 client
  • Bibliographic records include non-Latin scripts


  • You need Z39.50 client software that is:
    • Integrated or compatible with your local online system
    • Capable of implementing the OCLC Extended Services Definition of Version 3 (Z39.50-1995) for setting holdings (not required for libraries that return holdings via data sync or EDX).

       Note: Consult with your local system vendor and/or system administrator for information on implementation of the OCLC Extended Services Definition and assistance with local client configuration.

  • Also required is the ability to extract OCLC-derived Z39.50 records from your local system (for libraries setting holdings via data sync or EDX only)