DNS Wiki

Plain-English guides to DNS records and how to verify them with online tools.

This wiki explains common DNS record types, typical mistakes, and how to validate each record online. Use the linked tools to verify live DNS answers and compare resolver results when troubleshooting propagation.

DNS record guides

A record

IPv4 address mapping, apex vs www, and common pointing mistakes.

AAAA record

IPv6 addressing, dual stack setup, and connectivity pitfalls.

MX record

Mail routing priorities, MX target requirements, and delivery checks.

TXT record

SPF, DMARC, DKIM, verification strings, and long TXT formatting.

CNAME record

Aliases, SaaS integrations, and chain troubleshooting.

NS record

Delegation, authoritative name servers, and registrar alignment.

SOA record

Zone metadata, serials, and refresh timers.

PTR record

Reverse DNS, email reputation, and IP ownership constraints.

SPF

Sender policy, lookup limits, and validation warnings.

DMARC

Policy, alignment, reporting, and enforcement guidance.