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.