DNS Monitor

The DNS Monitor checks DNS responses for a hostname (e.g. example.com) on a fixed interval. This helps you detect unexpected record changes (A/AAAA), missing MX records, or TXT changes (SPF/DMARC / domain verification).

How it works

We resolve the selected record types (RRTypes) (e.g. A, AAAA, MX, TXT).
Optionally, we compare the resolved values against your Expected Values.
Depending on your trigger settings, we can create incidents/alerts for:
- Resolve Error (e.g. NXDOMAIN, timeout)
- Mismatch (resolved values differ from Expected Values)

Configuration

Basic settings

Hostname: Hostname only, without protocol or path (e.g. example.com, not https://example.com/path).
Check interval: How often to check (e.g. every 30 minutes).
Status:
- active: checks run normally.
- maintenance: checks still run, but alerting may be dampened depending on alert logic.
- disabled: checks do not run.

DNS checks

RRTypes: Comma-separated list, e.g. A, AAAA, MX, TXT.
Match mode:
- exact: values must match exactly.
- contains: expected values must be contained in the response.
Expected values: a list per RRType (one value per line). Empty fields mean “do not validate”.
Triggers:
- resolveError: alert on DNS resolve errors.
- mismatch: alert when Expected Values do not match.

Monitoring locations

DNS checks run from our monitoring locations. If a monitor does not specify its own restrictions, (if configured) the customer-level allowed countries apply.