Domain Monitoring
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Domain monitoring is the continuous observation of a domain's registration status, DNS configuration, WHOIS data, and SSL certificate validity to detect unplanned changes or impending expirations. Monitoring services poll these data sources at regular intervals—sometimes every few minutes—and trigger [[domain-alert|domain alerts]] when anomalies are detected, such as a changed [[nameserver|nameserver]], modified registrant contact, or a lapsing SSL certificate. Enterprise portfolio owners often rely on dedicated monitoring platforms that aggregate status across hundreds of domains and integrate with incident-management systems to ensure rapid response.
Example
A monitoring service detects that your domain's nameservers changed from ns1.registrar.com to an unknown host at 3 a.m. and immediately pages your on-call engineer via PagerDuty.