DNS Guides & Reference
Practical reference material for interpreting DNS records, troubleshooting propagation, and validating email authentication. Written for engineers who run change windows.
How to Read DNS Records
Walk through every core record type (A, AAAA, MX, NS, TXT, CNAME, SOA, CAA), how to interpret the data in the lookup UI, and how to gather the same information through the API for automation.
Troubleshoot DNS Propagation
Understand why DNS changes take time to appear globally, how TTL values affect propagation speed, and how to use the propagation checker to monitor resolver updates during migrations and cutovers.
DNSSEC Validation
DNSSEC adds cryptographic signatures to DNS records, preventing spoofing and cache poisoning. Use the validator to check DS records, DNSKEY, and the full chain of trust from root servers to your domain.
Quick Reference: Record Types
| A | Maps hostname to IPv4 address |
| AAAA | Maps hostname to IPv6 address |
| CNAME | Aliases one hostname to another |
| MX | Mail exchange servers with priority |
| TXT | SPF, DKIM, DMARC, verification tokens |
| NS | Authoritative nameservers for the zone |
| SOA | Start of authority, serial, refresh timers |
| CAA | Certificate authority authorization |