Master the Domain
Name System
TheDNS.guru is your comprehensive educational resource for understanding DNS — from how it resolves your website to securing your infrastructure against modern threats.
The Internet's Address Book
DNS — the Domain Name System — is the distributed, hierarchical system that translates human-readable domain names like thedns.guru into IP addresses like 203.0.113.42 that computers use to communicate.
Without DNS, you would need to memorize numeric IP addresses for every website you visit. DNS is so fundamental that virtually every internet-connected action begins with a DNS query.
How DNS Servers Work →Everything You Need to Know
In-depth guides covering DNS infrastructure, security, and email authentication
DNS Servers
Understand resolvers, authoritative servers, root servers, and how the DNS hierarchy works end-to-end.
Learn more →DNS Security
Learn about DNSSEC, cache poisoning, DNS hijacking, and how to defend against DNS-based attacks.
Learn more →Email Security
Master SPF, DKIM, and DMARC to authenticate your email and stop spoofing and phishing attacks.
Learn more →Common DNS Record Types
The building blocks of the Domain Name System
Ready to secure your domain?
Learn how SPF, DKIM, DMARC, and DNSSEC protect your organization from DNS-based attacks.