Free DNS, DevOps & SysAdmin Toolsfor Linux & DevOps Engineers
DNS, SSL, email health checker, Nginx generator, SSH config, subnet calculator, uptime calculator & sysadmin games — free forever, no signup required.
DNS, Email, DevOps & Games
Ready to use instantly
Queries are not logged
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Troubleshoot a Problem
Not sure which tool? Start here — we diagnose automatically
How It Works
Enter your domain
Type any domain name — we automatically strip http://, www. and paths.
Select the tool
Choose DNS lookup, SSL checker, or any of our network diagnostic tools.
Get instant results
Results come back in milliseconds, powered by Cloudflare DoH and Node.js TLS.
🎮 Need a Break? Play a Quick Game
Test your sysadmin skills with our free browser games
Trivia Quiz
Test your sysadmin and DevOps knowledge across three difficulty levels
Port Memory Match
Match port numbers to their services before time runs out
Sudo Says
Remember and repeat the Linux command sequence in the correct order
Terminal Speed Typer
Type real Linux commands as fast and accurately as you can
Packet Defender
Defend your server from malicious packets in a fast-paced tower defense game
Why Use SysAdmin Tools?
Free & No Signup Required
SysAdmin Tools is completely free to use. There are no accounts, no API keys, and no rate limits on any of our tools. Every tool on this site is accessible immediately — just enter a domain and get results in seconds. We built this because we needed these tools in our own daily work and got tired of paywalls and account registration requirements on other sites.
Accurate Results Powered by Cloudflare
Our DNS lookup tool queries Cloudflare's DNS over HTTPS (DoH) resolver, one of the fastest and most accurate DNS resolvers in the world. This means you get real-time, authoritative DNS propagation data rather than cached results. For SSL checks, we establish a real TLS connection to your server using Node.js built-in TLS — no third-party certificate databases that might be outdated.
Built for Sysadmins & DevOps
This site was built by Sachin, a Senior Linux & DevOps Engineer with 14+ years of experience managing production infrastructure. Every design decision — from the dark theme to the copy-to-clipboard buttons on DNS values to the monospace font for record data — was made with practicing sysadmins in mind. No marketing fluff, just the tools you actually need when debugging DNS issues at 2am.