How to monitor DNS changes over time?
Commercial services:
- DNS Spy - tracks changes, alerts on modifications
- Datadog DNS monitoring - enterprise-grade tracking
- Uptimerobot - DNS monitoring with alerts
DIY monitoring:
- Script to query and log records periodically
- Compare current to previous values
- Alert on differences
What to monitor:
- SPF record (unauthorized changes)
- MX records (mail routing hijacking)
- DKIM selectors (key changes)
- DMARC policy (policy weakening)
Unexpected DNS changes can indicate compromise or accidental modification. Early detection prevents damage.
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