DNS change detection
DNS monitoring catch changes instantly
Track DNS records across all your client sites and get alerted the moment something changes. Detect unauthorized modifications, failed migrations, and misconfigurations.
# dns records: clientsite.com
A (Address)
CNAME (Canonical Name)
MX (Mail Exchange)
TXT (Text)
Why DNS monitoring
Protect against silent DNS failures
DNS changes can break email delivery, redirect traffic to the wrong server, or indicate domain hijacking. For agencies managing client domains, undetected DNS changes are a ticking time bomb. Sentinel watches every record and alerts you instantly.
- Track A, AAAA, CNAME, MX, NS, TXT, and SOA records
- Automatic baseline snapshots for change detection
- Instant alerts when any record changes unexpectedly
7
Record types
24/7
Continuous scanning
<1m
Change detection
100%
Record coverage
Features
Complete DNS visibility
7 record types
Monitor A, AAAA, CNAME, MX, NS, TXT, and SOA records. Full coverage of your client's DNS configuration.
Baseline snapshots
We take a snapshot of your DNS records when monitoring starts. Every check is compared against this baseline.
Change detection
Instantly detect when a DNS record is added, removed, or modified. No change goes unnoticed.
Instant alerts
Get notified via email, SMS, Slack, or webhooks the moment a DNS change is detected.
Incident history
Every DNS change creates a detailed incident record showing exactly what changed, when, and the old vs new values.
Bundled with uptime
DNS monitoring runs alongside your uptime checks. Enable it when creating a monitor, with no extra configuration needed.
Change log
See exactly what changed
Every check is compared against the baseline snapshot we took when monitoring started. When a record is added, removed, or modified, we open an incident that records the old value, the new value, and the moment it flipped.
DNS changes detected
MX (Mail Exchange)
10 smtp.oldhost.net→10 mail.google.com
TXT (Text)
v=spf1 include:_spf.google.com ~all
Which DNS records does Sentinel monitor?
DNS monitoring watches your A, AAAA, MX, and NS records for changes, so you can see when an address, mail, or nameserver record is modified.
How will I know when a DNS record changes?
Sentinel alerts you the moment a change is detected. Notifications can be sent via email, SMS, Slack, Discord, and webhooks.
Why does an unexpected DNS change matter?
Unexpected DNS changes can break email delivery, send traffic to the wrong server, or signal a domain hijack. Catching them quickly lets you respond before clients are affected.
Can I monitor DNS for all of my client domains?
Yes. Sentinel is built for agencies and freelancers, so you can monitor DNS records across every client domain from one account.
Does DNS monitoring work alongside other checks?
Yes. DNS pairs with the other monitor types Sentinel offers (HTTP/HTTPS uptime, SSL certificate, domain expiration, keyword, JSON/API response assertions, ICMP ping, TCP port and heartbeat/cron checks), so you can mix the right combination for each site.
Is there a free trial?
Yes. Paid plans include a 14-day free trial, there is also a free plan, and you can cancel anytime.
Never miss a DNS change again
Start monitoring DNS records across all your client sites.
No card for the free plan · 14-day trial on paid plans · Cancel anytime