DNS Diagnostics
20 tools
Propagation checks, record lookups, DNSSEC validation, and ownership context for domain operations.
Infrastructure Diagnostics Hub
One brand hub for DNS, email, network, security, and webmaster diagnostics.
DNSnexus centralizes tool execution, educational guidance, and shareable result URLs so teams can debug faster without account friction.
Live Tools
60+
Across DNS, Email, Network, Security, Webmaster, and IP.
Categories
6
Dedicated hubs with internal linking and structured page architecture.
Result URLs
Shareable
Tool states sync to query params for faster team handoff.
Access
Free
No account required to run diagnostics and read documentation.
Universal Tool Finder
Suggested by intent
DNS incident
Check authority, lookup answers, and propagation.
Email auth
Validate SPF, DKIM, DMARC, and compliance readiness.
Category Command Grid
Jump directly into every tool family.
Each category page groups focused tools so operators can move from broad checks to specific root-cause validation.
Email Authentication & Deliverability
14 tools
SPF, DKIM, DMARC, MX, SMTP, compliance, and reporting checks for sender trust.
Network Operations
7 tools
Route, ownership, address planning, and path diagnostics for infrastructure troubleshooting.
Webmaster & Technical SEO
6 tools
Header inspection, redirects, crawlability signals, and link structure analysis.
Security Checks
8 tools
TLS, DNS, email, and website posture checks with guided hardening workflows.
IP Intelligence
5 tools
Quick geolocation and network ownership context for incident and abuse triage.
Cornerstone Guides
Educational playbooks that pair with live tools.
Guides explain implementation choices, failure modes, and verification strategy for recurring infra tasks.
🌐dns
FQDN (Fully Qualified Domain Name) Explained
An FQDN, or fully qualified domain name, is a domain name that spells out its exact position in the DNS hierarchy — hostname, subdomain, second-level domain, and top-level domain — with nothing left for a resolver to guess. `mail.example.com` is an FQDN; `mail` or `example` alone is not, because neither one unambiguously identifies a single host on the internet.
9 minRead guide →
🔒security
SSL Certificate Types: DV vs OV vs EV vs Wildcard
SSL certificate types split along two independent axes that get conflated constantly: validation level (how thoroughly the certificate authority checks who you are — DV, OV, or EV) and domain coverage (how many hostnames one certificate protects — single, wildcard, or multi-domain). Picking the wrong combination either wastes money on verification you don't need or leaves subdomains unprotected.
11 minRead guide →
🕷️webmaster
WHOIS Lookup: What It Is and What It Reveals
A WHOIS lookup is the fastest way to find out who registered a domain, when it expires, and which nameservers control its DNS. It queries a public registration database maintained by domain registries and registrars, returning data like the registrar name, creation and expiration dates, nameservers, and domain status codes — though personal registrant details are now redacted by default under privacy law.
11 minRead guide →
FAQ
Platform Questions, Answered
This section is intentionally open and fully rendered so users and crawlers can read the complete context.
Frequently Asked Questions
What is DNSnexus designed for?
DNSnexus is a multi-category diagnostics hub for DNS, email authentication, network operations, webmaster checks, and security verification workflows.
Do I need an account to run the tools?
No. Core tooling is available without signup so teams can run checks quickly during migrations, incidents, and routine audits.
How many tool categories are available?
The platform currently covers six categories: DNS, Email, Network, Webmaster, Security, and IP intelligence.
Are tool results shareable with my team?
Yes. Most tools sync key state into URL query params, allowing responders to open the same context during incident handoffs.
How should I use guides with tools?
Use guides for planning and interpretation, then run the linked tools to validate live environment behavior and confirm remediation.
Can browser-based checks replace provider logs?
Browser-safe checks are high-value for triage, but provider logs and authoritative infrastructure telemetry remain the final source of truth.
What makes the homepage different after this revamp?
The homepage now acts as a command center with workflow-driven discovery, category-level navigation, guide pathways, and SEO-first information architecture.
Does DNSnexus support technical SEO troubleshooting?
Yes. Webmaster tools include redirect tracing, header inspection, user-agent checks, link analysis, and technical search presence diagnostics.
How often are new tools and guides added?
The platform is being expanded continuously across all categories, with new tool routes and related editorial guides published in phased batches.
Is this homepage content crawlable by search engines?
Yes. Core sections, guide summaries, and FAQ content are prerendered HTML and fully indexable by search engines.
Next action
Move from discovery to execution in one click
Start with the directory, jump into a workflow path, or open guide-driven diagnostics based on your current operational objective.