DNS Sentinel (/tools/dns-sentinel) performs global authoritative DNS queries across 20+ geographically diverse recursive resolvers (Cloudflare, Google, OpenDNS, Quad9, and regional ISPs).
Supported Record Types
- A / AAAA: IPv4 and IPv6 endpoint routing records.
- CNAME: Canonical name aliases and CDN edge mappings.
- MX: Mail exchange records and priority routing.
- TXT: Domain ownership, SPF (
v=spf1), DKIM, and DMARC security policies. - NS: Authoritative nameserver assignments.
- SOA: Start of Authority, zone serial numbers, and refresh timers.
- CAA: Certificate Authority Authorization rules.
Automated DNS Watchdog
In SteadyStack, you can turn any DNS record check into an automated surveillance monitor:
- Record Hijack Detection: Alerts immediately if an
AorCNAMErecord is modified unexpectedly. - Propagation Verification: Verifies 100% global propagation before cutting over DNS traffic for a client.
- SPF/DMARC Protection: Detects accidental deletion of critical email deliverability TXT records.