Global library catalog and discovery website

WorldCat

WorldCat is a popular library discovery website and OCLC database that helps people find books, articles, media, archival materials, and other resources held by libraries around the world.

Core use

WorldCat helps users search library collections, compare records, and find nearby or participating libraries that may hold an item.

Operator

WorldCat is run by OCLC, a library cooperative and nonprofit organization serving libraries and cultural institutions.

Catalog model

OCLC describes WorldCat as a database combining a bibliographic catalog, e-resource holdings, and library location information.

WorldCat is a global library catalog and discovery website operated by OCLC.View image on original site

What WorldCat is

WorldCat is a global library catalog and discovery website. On WorldCat, people can search for books, ebooks, articles, movies, music, archival materials, and other resources, then see which libraries list or provide access to those items.

Library discovery

A WorldCat search brings together catalog data from many libraries so a person can look beyond one local catalog. That is useful when a book, film, journal, score, thesis, or archival item is hard to find through ordinary web search or a single library website.

Bibliographic records

WorldCat records describe works and editions with titles, authors, publishers, subjects, formats, languages, identifiers, and holding libraries. The record is not the item itself; it is structured information that points readers toward libraries and services that may provide access.

Libraries and OCLC

WorldCat is closely tied to OCLC member libraries. Libraries contribute, improve, and reuse shared records, while OCLC services connect those records to discovery, cataloging, resource sharing, e-resource management, and library profile information.

Finding copies

For readers, the most practical use is often locating a copy. A WorldCat page may show nearby libraries, links to local catalogs, digital access options, or pathways to request an item through a library. Actual borrowing rules still depend on the local institution.

Why it matters

WorldCat matters because library holdings are spread across cities, universities, public systems, special collections, archives, and national institutions. A shared catalog can make hidden or distant materials discoverable, support interlibrary loan, and help researchers trace editions and availability.

Limits and cautions

WorldCat is not a guarantee that every library owns a resource or that every listed item is borrowable. Holdings can be outdated, local catalogs may disagree, some libraries do not participate, and access to ebooks or databases can depend on subscriptions, location, or patron status.

WHOIS domain data

Data pulled: May 20, 2026View current WHOIS record

Domain: worldcat.org
IP address: 104.18.32.188
Registrar: Network Solutions, LLC
WHOIS server: whois.networksolutions.com
Referral URL: http://www.networksolutions.com
Created: January 21, 1998
Updated: December 12, 2018
Expires: January 20, 2028
Nameservers: michelle.ns.cloudflare.com (108.162.192.201); nico.ns.cloudflare.com (172.64.35.147)
Domain status: clientTransferProhibited
Contact information: Who.is lists the registrant location as Dublin, OH, US, with registrant and technical contact emails visible in the record.

Key concepts

Union catalogA shared catalog that combines records and holdings from many libraries.
Holding libraryA library that reports access to a specific item, edition, database, or resource.
Bibliographic metadataStructured information about a resource, such as author, title, publisher, date, subject, format, and identifiers.

Website features

Search books, articles, ebooks, videos, music, maps, archival materials, theses, and other library resources.
Filter or compare results by format, author, date, language, topic, and library availability.
Open local catalog links, save lists, follow library profiles, and explore related works or editions.

Common misconceptions

WorldCat is not itself a public library card or a universal borrowing service.
A listed holding does not always mean the item is currently on the shelf or available to every visitor.
WorldCat is broad, but it does not include every library collection, unpublished item, private archive, or local database.

Open questions

How can shared catalogs keep holdings current as libraries change systems, licenses, and collection priorities?
How should global catalog services represent ebooks and licensed databases that have complicated access rules?
Can discovery tools make rare, local, and non-English materials easier to find without overwhelming casual users?