DomainTools Whois History User Guide & How-To | DomainTools
https://www.domaintools.com/resources/user-guides/whois-history/
WEBThe Whois History page consists of three main sections: the search and filter controls, the timeline, and the Whois record display. Where the earlier version displayed dates for all Whois records in the DomainTools. database for a given domain, the new layout, by default, highlights just those dates on which something changed in the Whois record.
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