Why a domain needs more than one kind of monitoring
A domain looks like a single thing, but it's really a small stack of independent parts, and each can fail on its own timeline. Registration sits at the bottom: let it lapse and DNS stops resolving, so the site vanishes, mail bounces and even a valid certificate can't be served — all at once. On top of that, the SSL certificate has its own expiry date that has nothing to do with the domain's. Above that, WHOIS and DNS are the control plane: change a name server or an MX record — deliberately or by accident — and traffic quietly goes somewhere else. Uptime is only the surface: it's the symptom you notice last, once something underneath has already broken.
Watching just one of these leaves a gap exactly where the others live. That's the whole point of monitoring a domain as a system rather than a single ping: the failures don't overlap, so the coverage shouldn't either.
The signals catch different failures
- Expiry is 100% predictable — the date is known months ahead, so a lapse is entirely preventable with a reminder.
- SSL fails on a fixed schedule and, thanks to short-lived certificates, does so several times a year.
- WHOIS changes flag transfers, status codes like clientHold, and the early signs of a hijack.
- DNS changes reroute your site and mail — often silently, and often the real cause of an "outage".
Domain monitoring vs uptime monitoring
Uptime monitoring reacts: it tells you the site went down, after it already did. Domain monitoring warns: it flags an expiry, a certificate or a record change before it turns into an outage — precisely the failures an uptime check physically can't see, because the server is healthy until the moment it isn't. The two answer different questions, and they sit at different layers — an uptime tool watches the surface, these four checks watch what the surface depends on.
All four, in one dashboard
Domain Monitor Hub watches every one of these signals for the domains you own and routes the alerts wherever you want them — email, webhook, Discord or Slack. Start with the free plan, add your domains, and each of the four checks runs automatically. Prefer to look before you commit? Every check also exists as a free one-off tool.