How DNS Works: The Internet's Phone Book Explained
How a domain name becomes an IP address: resolvers, root and TLD servers, record types, caching, and what to check when DNS goes wrong.

How a domain name becomes an IP address: resolvers, root and TLD servers, record types, caching, and what to check when DNS goes wrong.

Follow one request from your keyboard to your screen: DNS, TCP, TLS, HTTP and rendering, explained step by step in plain English.

TCP, UDP, HTTP, DNS and more: the eight protocols behind almost everything you do online, explained in plain words with diagrams and commands you can try.

A first-principles walkthrough of what happens when you hit Enter—from DNS resolution and TCP handshakes to TLS, HTTP, and the round trips behind web performance.
