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Every time you visit a website, send an email, or stream a video, the Domain Name System translates human-readable names into machine addresses. DNS is the internet's most critical infrastructure, yet most developers never look beneath the surface of a single library call. This book changes that. You will build a complete, production-quality recursive DNS resolver in Zig from zero to deployment, learning every layer along the way: wire-format packet parsing, UDP and TCP transport, iterative resolution against root servers, caching with TTL management, EDNS(0) extensions, DNSSEC validation fundamentals, security hardening against cache poisoning and amplification attacks, lock-free concurrent data structures, event-driven I/O, performance profiling, fuzzing, and production deployment. By the end, you will have a fully working recursive resolver and a deep understanding of one of the internet's most important protocols.

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Kick off your book project, get started with GhostAI, get better at marketing, or spend the day doing all three! Free live workshops on Zoom. Saturday, June 27, 2026.

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