Making the internet's most important invisible system visible, understandable, and inspectable.
DNS is the internet's most important invisible system. Every website visit, every email delivered, every API call made begins with a DNS query. Over 5.8 billion of them happen every second. Yet most developers, system administrators, and even security professionals treat DNS as a black box — something that "just works" until it suddenly doesn't.
dnslab.dev exists to change that. We are building a free, open platform that combines comprehensive documentation, structured courses, and hands-on diagnostic tools to give anyone the knowledge and confidence to understand, debug, and optimize DNS. Whether you are configuring your first A record or designing a multi-provider anycast architecture, this is your starting point.
Comprehensive documentation and structured university courses covering DNS from fundamentals to advanced operations. Read at your own pace or follow a guided curriculum with exercises and progress tracking.
Free DNS diagnostic tools — lookup, propagation checker, WHOIS, and health monitoring. Inspect real DNS data, trace resolution paths, and validate your configurations without leaving the browser.
Connect with DNS practitioners, share knowledge, and learn from real-world operational experience. Discussions, leaderboards, and events for people who care about the resolution layer.
dnslab.dev is an open-source project and contributions are welcome. There are several ways to get involved:
dnslab.dev is built with SvelteKit, TypeScript, and Tailwind CSS, hosted on modern infrastructure, and powered by a deep appreciation for the engineers who designed and continue to operate the Domain Name System. Special thanks to the RFC authors, IANA, the root server operators, and the broader DNS operations community whose work makes the internet function every single day.
The platform's content draws on decades of operational knowledge, academic research, and community-driven best practices. We stand on the shoulders of Paul Mockapetris, Paul Vixie, Dan Kaminsky, and the countless engineers who have shaped DNS into the resilient system it is today.