^英語版の基礎情報ボックス。
{{infobox website
| name = WorldCat
| logo = WorldCat logo.svg
| logo_size =
| logo_alt = Five-color WorldCat emblem, with WorldCat in black letters and OCLC in smaller grey letters
| logo_caption =
| screenshot = WorldCat homepage.png
| collapsible = y
| collapsetext = Screenshot
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^1998 is the date of registry of the WorldCat.org domain; see:
<ref>{{cite web
|url=http://whois.domaintools.com/worldcat.org
|title=WorldCat.org WHOIS, DNS, & Domain Info – DomainTools
|work=[[:en:WHOIS]]|access-date=2017-01-21
|archive-date=June 20, 2019
|archive-url=https://web.archive.org/web/20190620011555/http://whois.domaintools.com/worldcat.org|url-status=live
}}</ref>
However, the union catalog that became WorldCat was started three decades earlier, and it was already available on the web to subscriber libraries at OCLC.org several years before WorldCat.org was a registered domain name; <ref>see:
{{cite web
|url=http://whois.domaintools.com/oclc.org
|title=OCLC.org WHOIS, DNS, & Domain Info – DomainTools
|work=[[:en:WHOIS]]|access-date=2019-06-26
|archive-date=June 26, 2019
|archive-url=https://web.archive.org/web/20190626214826/http://whois.domaintools.com/oclc.org
|url-status=live
}}</ref>
