Updated 2026-06-16
A DNS check resolves a record for a domain and confirms it looks the way you expect. It catches problems an HTTP check can't see, like a misconfigured zone or a record that was accidentally changed or removed.
Configuration options
- Record type —
A,AAAA,CNAME,MX,TXT, orNS. - Resolver — optionally pin the check to a specific resolver (for
example
8.8.8.8) instead of the default. - Expected values — optionally list the values you expect the record to resolve to. If you leave this blank, the check only confirms the record is resolvable at all.
When to use it
- Catching an accidental DNS change (someone edits an
Arecord and points it at the wrong host). - Confirming
MXrecords are correct so mail keeps routing properly. - Watching a
CNAMEused for a custom status page domain or another third-party integration.
DNS checks are lightweight and independent of whatever's actually running on the resolved host — pair one with an HTTP or TCP check on the same target for full coverage.