Learn DNS

Master the Domain Name System from basics to expert level. Eight parts covering DNS history, resolution, security, infrastructure, and the domain industry.

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Every website you visit, every email you send, every app you open — it all starts with a name becoming a number. The Domain Name System is the invisible engine that makes the modern web possible, and this knowledge base is your guide to understanding how it all works.

Part 1 Origins & History of DNS1

How the internet learned to remember names — from ARPANET's HOSTS.TXT to the global Domain Name System.

1.1 The Pre-DNS Era ~8 min

1.2 Paul Mockapetris and the Problem He Solved ~8 min

1.3 The Original Root Servers ~8 min

1.4 The NSI Monopoly Era (1993-1999) ~8 min

1.5 Timeline of Major DNS Milestones ~12 min

Part 2 How DNS Works2

The technical mechanics of the Domain Name System — from fundamental concepts to protocol-level details.

2.1 DNS Fundamentals ~10 min

2.2 The Resolution Process ~12 min

2.3 DNS Record Types ~15 min

2.4 DNS Caching and TTL ~11 min

2.5 Authoritative vs Recursive Resolvers ~10 min

2.6 The Root Zone and Root Servers ~12 min

2.7 Zone Files and Zone Transfers ~12 min

2.8 DNS Protocol Deep Dive ~14 min

Part 3 The Domain Ecosystem3

The business and operational side of domain names — how domains are named, registered, transferred, and managed across the registry-registrar system.

3.1 Domain Name Anatomy ~10 min

3.2 TLD Types ~11 min

3.3 The Domain Lifecycle ~11 min

3.4 Registries, Registrars, and Resellers ~12 min

3.5 WHOIS and RDAP ~12 min

3.6 Domain Transfers ~10 min

3.7 DNS Hosting vs Domain Registration ~9 min

3.8 EPP Deep Dive ~12 min

Part 4 DNS Security4

From foundational vulnerabilities to encrypted transport and protective DNS — how the internet's naming system learned to defend itself.

4.1 DNS Vulnerabilities ~12 min

4.2 DNSSEC ~14 min

4.3 DNS-over-HTTPS (DoH) ~12 min

4.4 DNS-over-TLS (DoT) ~10 min

4.5 DNS-over-QUIC (DoQ) ~10 min

4.6 DNS Hijacking and BGP Attacks ~11 min

4.7 Protective DNS and Threat Intelligence ~12 min

Part 5 Modern DNS Infrastructure5

How DNS powers today's internet — from CDNs and load balancing to containers, edge computing, and zero-configuration networking.

5.1 CDN and DNS ~10 min

5.2 DNS Load Balancing and Failover ~11 min

5.3 Split-Horizon DNS ~9 min

5.4 Dynamic DNS (DDNS) ~10 min

5.5 Multicast DNS and DNS Service Discovery ~10 min

5.6 DNS in Containers and Kubernetes ~12 min

5.7 Serverless DNS and Edge Computing ~10 min

Part 6 The Domain Industry6

The business, governance, and legal side of domains — from ICANN policy and gTLD programs to domain investing, valuation, privacy, and legal disputes.

6.1 ICANN Governance ~12 min

6.2 The New gTLD Program ~12 min

6.3 Domain Investing and the Aftermarket ~12 min

6.4 Domain Valuation Methodologies ~11 min

6.5 Domain Privacy and Proxy Services ~11 min

6.6 Legal Aspects ~13 min

6.7 Country Code Politics ~12 min

Part 7 Practical DNS for Developers7

The hands-on guide — real commands, real configs, and real-world workflows for building, debugging, and automating DNS.

7.1 Setting Up DNS for a Website ~12 min

7.2 Email DNS ~14 min

7.3 DNS Debugging Tools ~14 min

7.4 Common DNS Misconfigurations ~12 min

7.5 DNS Automation and Infrastructure as Code ~13 min

7.6 API-Driven DNS Management ~13 min

7.7 DNS and CI/CD Pipelines ~13 min

Part 8 The Future of DNS8

Where DNS and domain naming are headed — from blockchain-based alternatives to quantum-resistant cryptography and the rise of AI agents.

8.1 Decentralized Naming ~12 min

8.2 AI Agents and DNS ~11 min

8.3 Encrypted Client Hello (ECH) ~10 min

8.4 SVCB and HTTPS Record Types ~10 min

8.5 The Next Billion Domains ~10 min

8.6 Quantum Computing and DNS ~11 min