WHOIS Monitoring
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WHOIS monitoring is the automated, periodic querying of WHOIS (or [[rdap|RDAP]]) records for one or more domains to detect changes in registrant contact details, [[nameserver|nameservers]], [[domain-status-codes|status codes]], expiration dates, or sponsoring [[registrar|registrar]]. Any unexpected change—such as the registrant organization name updating without authorization—can indicate account compromise, unauthorized transfer, or [[domain-hijacking|domain hijacking]], making early detection critical. WHOIS monitoring services baseline the current record and trigger [[domain-alert|domain alerts]] whenever a diff is detected, providing a timestamped audit trail that is invaluable during incident response. Coverage gaps exist for some ccTLDs that rate-limit or restrict WHOIS queries.
Example
A WHOIS monitoring service alerts you at 2 a.m. that your company's primary domain now lists a different registrant email address—an early signal that your registrar account may have been compromised.