Uptime monitoring
DNS monitoring for records that must not change
A mistyped record or an expired domain takes everything down at once — website, email and APIs. DNS monitors resolve your records over DNS-over-HTTPS and alert if resolution fails or the answer stops matching what you expect.
What to monitor on DNS
- 01Resolution successNXDOMAIN or SERVFAIL means users cannot reach you at all.
- 02Answer matches expectedDetect hijacking or accidental changes to A, MX or NS records.
Set it up
Create a DNS monitor
Target: your hostname. record_type: A, AAAA, CNAME, MX, TXT or NS.
Optionally set an expected value
e.g. expected: 203.0.113.10 — the check fails if no answer contains it.
Recommended alerts for DNS
- Record fails to resolve
- Answer no longer contains expected value
Send alerts to
DNS monitoring FAQ
Which resolver is used?
Cloudflare’s 1.1.1.1 over DNS-over-HTTPS.
Can I monitor SPF or DMARC records?
Yes — use record_type TXT and set expected to a substring like v=spf1.
Know before your users do.
Free forever for 3 servers and 10 monitors. No credit card. Install the agent in under a minute.