DNS records explained: A, AAAA, CNAME, MX, TXT, SRV, CAA — and the gotchas

invalid@example.com (Aior), Aior
Fri, 01 May 2026 07:05:32 +0000
DNS Records

DNS is the protocol everyone uses and few understand​
DNS bugs are some of the most common production issues. The reason: DNS is conceptually simple but operationally subtle, and most teams pick up just enough to deploy something working without ever learning the corners. Below is the practical reference for the records that actually matter.

A and AAAA​

A — points a name to an IPv4 address

AAAA — points a name to an IPv6 address

The fundamentals...