The infrastructure diagnostic platform built for people who care about their stack.
DNSnexus brings together 58+ free DNS, email, network, security, and IP tools — each backed by technical content that helps you understand not just the result, but the system behind it.
Make infrastructure diagnostics accessible to everyone.
DNS, email authentication, TLS configuration, and network routing are foundational to how the internet works — yet the tools for diagnosing them are often scattered across command-line utilities, paid platforms, and outdated websites.
DNSnexus was built to change that. We aggregate the most important diagnostic workflows into a single, fast, free platform — one where every tool gives you a real result alongside the context to understand it.
Whether you're a developer debugging a DMARC policy, a sysadmin tracking down a DNS propagation delay, or a security engineer verifying SSL chain integrity — DNSnexus gives you the tools without the friction.
No ads. No data selling. No dark patterns.
DNSnexus is not an advertising platform. We do not run banner ads, sponsored results, or affiliate placements that influence tool output. There are no paid placements that affect which results you see.
We do not sell, share, or broker your data with third parties for marketing purposes. Tool inputs — domain names, IP addresses, email addresses — are processed in real-time and not stored persistently for anonymous users.
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What We Stand For
58+ Tools Across 6 Categories
Every tool has a dedicated page with a live interactive widget and in-depth technical documentation.
Continuous Domain Monitoring
For teams and individuals who need ongoing visibility, DNSnexus Monitor provides automatic checks every 6 hours across DNS records, SSL certificate expiry, email authentication posture, uptime, global propagation, blacklist status, and WHOIS data — all in a single dashboard.
Have a question or feedback?
We'd love to hear from you — feature requests, bug reports, or just to say hello.