DNS Header Reference
Interactive DNS packet header structure
The Domain Name System (DNS) is a hierarchical naming system that translates human-readable domain names to IP addresses. DNS messages contain a header section followed by question, answer, authority, and additional sections. Click any field below to learn more.
DNS Header Structure (12 bytes)
| Identification 16 bits | QR 1 | Opcode 4 | AA 1 | TC 1 | RD 1 | RA 1 | Z 3 | RCode 4 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| QDCount 16 bits | ANCount 16 bits | ||||||||||||||||
| NSCount 16 bits | ARCount 16 bits | ||||||||||||||||
Click on any header field to view its description