DNS Checker
Check a domain's DNS the way a monitor would: does it resolve from outside your own network, does it resolve consistently, and are the records that live in DNS — MX, SPF, DMARC, CAA — actually right? This runs as part of a full 12-point site scan (not a raw record-lookup console), and the complete report lands in your inbox.
100 of 100 free scans left today. We verify your email first — it keeps bots and AI scrapers from draining the daily pool, and it's where your report lands. Limits: one scan per email per day, one per connection per day.
We emailed a 6-digit code to . Enter it to start the scan — it expires in 10 minutes.
What the DNS checks cover
The scan verifies the domain resolves and resolves consistently, then reads the records DNS is responsible for beyond the A record: MX for inbound mail routing, SPF and DMARC for mail trust, CAA for certificate-issuance control. A surprising share of "the site is broken" reports are one of these records drifting while the web server itself is perfectly healthy.
When DNS is the culprit
DNS failures look like everything else: the site is unreachable for some visitors and fine for others, email stops arriving while the API answers 200, a renewal or provider change quietly rewrites a record. Because DNS sits in front of the server, no amount of checking the server itself will catch it — the test has to come from the outside, which is exactly where this scan runs.
Catching DNS drift before visitors do
Records change rarely — which is why nobody watches them, and why a bad change survives for days. A DNS monitor re-checks resolution on a schedule and alerts on the day a record drifts, not the day a customer mentions the site "sometimes doesn't load."
Holter watches this for you: outside-in monitors plus dead-man heartbeats for silent failures. Free plan: 5 monitors, 5-minute checks, no credit card.
Watch DNS continuously — free