DNS monitoring for client sites
For freelancers and agencies watching many client sites, DNS is the plumbing nobody looks at until something breaks — and when it breaks, the whole site or its email can vanish. A changed A record, a lapsed nameserver, or a hijacked domain all show up in DNS first. Here's what to watch.
What DNS records do
A/AAAA records point the domain at the site's servers, MX records route email, NS records name the authoritative nameservers, and TXT records hold things like SPF and verification tokens. Get one wrong and the symptom — site down, email lost — looks mysterious until you check the records.
Why changes are dangerous
An unexpected DNS change is a classic sign of a migration gone wrong or a domain hijack. Because DNS is cached, the damage can spread for hours before anyone notices. Watching the records means an unauthorized change becomes an alert instead of an outage.
Resolution resilience
Fewer than two nameservers is a single point of failure; a missing A record means the domain won't resolve at all. Basic DNS health checks catch these misconfigurations before they cause downtime.
Check and monitor
Look up any domain's records now with our free DNS checker, and monitor client domains so a DNS change or resolution failure is caught early rather than discovered by an angry client.
Frequently asked questions
What DNS problems cause a site to go down?
A missing or wrong A record, expired nameservers, or a hijacked domain. All are visible in DNS before the outage becomes obvious.
How often should DNS be checked?
Continuously for client sites — DNS changes are infrequent but high-impact, so an alert on change is worth far more than an occasional manual look.
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