Precise terms and record behavior

Use the reference when exact syntax, ownership, caching, coexistence, or standards language matters.

Terminology

Glossary

Precise definitions for delegation, bailiwick, authoritative data, recursive resolution, and related terms.

A · type 1

Understand DNS A records, IPv4 address syntax, owner-name behavior, caching, coexistence, and what an address answer proves.

NS · type 2

Understand DNS NS records at parents and child zones, nameserver targets, glue dependencies, caching, and delegation verification.

CNAME · type 5

Understand DNS CNAME aliases, canonical targets, coexistence restrictions, caching, apex limits, and verification boundaries.

SOA · type 6

Understand DNS SOA zone identity, serial and timer fields, negative caching, owner rules, provider behavior, and authoritative verification.

PTR · type 12

Understand reverse-DNS PTR records, address-to-name ownership, IPv4 and IPv6 reverse zones, caching, mail use, and verification limits.

MX · type 15

Understand DNS MX preference and targets, implicit and null MX behavior, caching, coexistence, and mail-delivery verification.

TXT · type 16

Understand DNS TXT strings, owner-specific semantics, coexistence, caching, security limits, and verification for email and tokens.

AAAA · type 28

Understand DNS AAAA records, IPv6 address syntax, owner-name behavior, caching, coexistence, and what an IPv6 answer proves.

SRV · type 33

Understand SRV service discovery, service and protocol labels, priority, weight, port, target rules, caching, and verification limits.

DS · type 43

Understand parent-side DNSSEC DS records, key tags, algorithms, digest fields, caching, ownership boundaries, and chain verification.

DNSKEY · type 48

Understand child-side DNSSEC public keys, flags, protocol and algorithm fields, RRset transitions, signatures, and parent DS matching.

CAA · type 257

Understand DNS CAA certificate-issuance authorization, flags, property tags and values, caching, CNAME boundaries, and verification limits.