Continuous DNS monitoring and resolution alerts
DNS issues stay invisible to standard ping monitors. Deltum checks your domain resolution and alerts your team the moment records drift or fail to respond.
Why DNS failures go unnoticed with traditional monitoring
Standard uptime monitors only check endpoints after the IP is already cached. If nameservers fail, a zone file is misconfigured, or a CNAME record points to the wrong host after a deploy, visitors cannot access your site even if the web server is running. Deltum continuously verifies resolution across major public resolvers (Cloudflare, Google, Quad9, OpenDNS).
Multi-Resolver Verification
Periodic queries across major public resolvers to catch regional outages and propagation delays early.
Record Change Detection
Instant alerts whenever an A, AAAA, CNAME, or MX record changes unexpectedly during migrations or updates.
Lookup Latency & DNSSEC
Track lookup response times and ensure cryptographic DNSSEC signatures remain valid.
How it works in 3 simple steps
Add your domain
Enter your domain in the dashboard. We automatically detect nameservers and core DNS records.
Choose check frequency
Run automated checks periodically, or scale up to 1-minute intervals depending on your plan and needs.
Get actionable alerts
When an anomaly occurs, receive an instant alert via Telegram, Email, Slack, or Webhook with clear error details.
Related Observability Layers
Combine DNS health checks with uptime probes, SSL certificates, and public status pages.
Uptime Monitoring
Monitor HTTP endpoints, APIs, and TCP ports with fast outage alerts.
SSL / TLS Certificates
Advance alerts before HTTPS certificates expire (30, 14, 7 days in advance).
Status Pages & SLAs
Publish public or private status dashboards with custom branding and domain.
Free DNS Checker Tool
Instant diagnosis of A, CNAME, MX, and NS records across global resolvers.
Frequently Asked Questions about DNS Monitoring
You can start with automated checks on the free tier, or upgrade to high-frequency intervals (up to every 1 minute) on paid plans.
If a single resolver has a temporary hiccup, we verify the result from an independent node before sending an alert, eliminating unnecessary noise.
Yes. You can monitor A, AAAA, CNAME, MX, TXT, and NS records for root domains and any subdomain level.
Protect your infrastructure DNS resolution starting today
Configure your first DNS monitor in under 60 seconds with global probing and multi-channel alerts.