The DNS Library
Technical reference for DNS concepts, infrastructure, security, and filtering.
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DNS 101: Introduction to the Domain Name System
An introduction to DNS explaining what problem it solves, why it is designed as a distributed system, and how its core roles fit together.
Domain Names, Labels, and the DNS Namespace
An explanation of how domain names are structured, how labels function, and how the hierarchical DNS namespace enables delegation and resolution.
DNS Zones and Delegation
How the DNS namespace is divided into zones, how authority is delegated, and why zone boundaries shape control, caching, and failure behavior.
DNS Caching and TTL: How DNS Remembers (and Forgets)
An explanation of how DNS caching works, what TTL really controls, and why DNS changes propagate unevenly across the internet.
Recursive vs Authoritative DNS: Who Answers What, and Why
An explanation of the two major DNS server roles, how they interact during resolution, and why the separation matters operationally.
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DNS Caching and TTL: How DNS Remembers (and Forgets)
An explanation of how DNS caching works, what TTL really controls, and why DNS changes propagate unevenly across the internet.
Recursive vs Authoritative DNS: Who Answers What, and Why
An explanation of the two major DNS server roles, how they interact during resolution, and why the separation matters operationally.
DNS 101: Introduction to the Domain Name System
An introduction to DNS explaining what problem it solves, why it is designed as a distributed system, and how its core roles fit together.
Domain Names, Labels, and the DNS Namespace
An explanation of how domain names are structured, how labels function, and how the hierarchical DNS namespace enables delegation and resolution.
DNS Zones and Delegation
How the DNS namespace is divided into zones, how authority is delegated, and why zone boundaries shape control, caching, and failure behavior.