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.

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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.
Platform Coverage
DNS
20 tools
Email
14 tools
Network
7 tools
Webmaster
6 tools
Security
8 tools
IP
5 tools
Universal Tool Finder
Suggested by intent
DNS incident
Check authority, lookup answers, and propagation.
DNS CheckDNS LookupDNS Propagation Checker
Email auth
Validate SPF, DKIM, DMARC, and compliance readiness.
SPF Record CheckerDKIM CheckerDMARC Checker
Monitoring Domains
Open monitor →
example.com
SSL renewal window, uptime latency, and DNS auth drift
store.example.com
MX/SPF/DMARC health plus blacklist watch
api.example.com
TLS chain status and network reachability trend
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.

Workflow Paths

Troubleshoot by objective, not just by tool name.

Guided sequences map common operational goals to ordered tool runs and outcomes.

DNS Migration Validation

Confirm authoritative records, monitor propagation spread, and verify final resolver behavior.

1
DNS Check
Comprehensive DNS server health checks for a domain.
2
DNS Lookup
Query A, AAAA, CNAME, MX, TXT, NS, SOA records.
3
DNS Propagation Checker
Live check from 100+ global DNS resolvers.
4
NS Lookup
Find authoritative nameservers and validate DNS authority.
5
WHOIS Lookup
Retrieve domain registration and ownership data.
Expected outcome
Detects whether a cutover issue is propagation delay, stale cache, or source misconfiguration.

Email Deliverability Hardening

Validate auth records, inspect policy alignment, and check blacklist/compliance indicators.

1
SPF Record Checker
Validate your SPF TXT record and lookup limits.
2
DKIM Checker
Verify DKIM selector and public key record.
3
DMARC Checker
Validate DMARC policy, alignment and reporting.
4
Blacklist Check
Check domain or IP against common DNS-based blacklists.
5
Google/Yahoo Compliance Checker
Check domain alignment with modern bulk sender requirements.
Expected outcome
Builds sender trust and lowers rejection risk for major mailbox providers.
Cornerstone Guides

Educational playbooks that pair with live tools.

Guides explain implementation choices, failure modes, and verification strategy for recurring infra tasks.

Browse all guides→
Start Here
Foundational guides for teams setting up diagnostics and baseline controls.
DNS Propagation Debugging Playbook
Differentiate cache delay from authoritative misconfiguration during DNS changes.
Speed up migration verification9 min read
DNS Propagation CheckerDNS LookupNS Lookup
SSL Expiry and Chain Validation Runbook
Detect expiry, issuer mismatch, and chain gaps before production outages.
Prevent TLS downtime6 min read
SSL Certificate CheckerHTTPS LookupHTTP Headers Check
Technical SEO Signals: Canonical, Redirects, Headers, Robots
Validate crawl and indexability signals with reproducible checks.
Improve technical discoverability10 min read
Search Presence CheckWebsite Redirect CheckerHTTP Headers Check
IP/ASN Ownership Investigation Guide
Attribute IP space accurately for abuse triage, routing context, and handoffs.
Improve network attribution8 min read
IP Geolocation LookupASN LookupARIN Lookup
Deep Dives
Technical walkthroughs for DNS, email auth, and web verification internals.
DNSSEC Validation with DNSKEY/DS/RRSIG/NSEC
Verify delegation chain integrity and authenticated denial-of-existence signals.
Harden DNS trust chain11 min read
DNSKEY LookupDS LookupRRSIG Lookup
SPF Design and 10-Lookup Budget Control
Build maintainable SPF policies that stay within RFC lookup limits.
Prevent SPF permerror8 min read
SPF Record CheckerSPF GeneratorGoogle/Yahoo Compliance Checker
DKIM Selector Strategy and Key Rotation
Standardize selector naming and rotate keys with minimal deliverability impact.
Strengthen email signing hygiene7 min read
DKIM CheckerDKIM Record GeneratorEmail Security Checker
Redirect Chain Hygiene for Migrations
Collapse unnecessary hops and preserve canonical authority during URL changes.
Reduce crawl loss and latency7 min read
Website Redirect CheckerHTTP LookupSearch Presence Check
Playbooks
Operational runbooks focused on migrations, incidents, and compliance readiness.
DMARC Enforcement Rollout (none → quarantine → reject)
Sequence DMARC policy escalation without hurting legitimate mail flow.
Reduce spoofing risk safely10 min read
DMARC CheckerDMARC GeneratorDMARC Report Analyzer
Email Deliverability Triage Checklist
Run high-signal checks for inbox placement, reputation, and auth alignment.
Recover inbox performance9 min read
Email Deliverability ReportBlacklist CheckSMTP Test
Port Exposure and Service Reachability Diagnostics
Correlate port scan, ping, and traceroute signals for network path triage.
Debug connectivity failures8 min read
Port ScannerPingOnline Traceroute
Incident Response Workflow: DNS + Network + Security
Combine DNS, network, and TLS checks into a repeatable triage loop.
Cut mean time to resolution12 min read
DNS CheckOnline TracerouteSSL Certificate Checker
Comparison / Decision Block

Which DNS tool should you run first?

Use this decision matrix to choose the right DNS tool based on your immediate objective, required input, and expected output.

ToolBest forInputOutputNext tool
DNS LookupInspecting current record answers for a specific hostname.Domain/hostA, AAAA, CNAME, MX, TXT, NS, SOA answersDNS Propagation Checker
DNS CheckRunning broad DNS health validation before/after changes.DomainRecord coverage summary and consistency checksNS Lookup
DNS Propagation CheckerMeasuring global resolver spread after DNS updates.Domain + record typePer-region answer variance and cache stateDNS Lookup
NS LookupConfirming authoritative nameserver delegation.DomainAuthoritative NS setWHOIS Lookup
WHOIS LookupChecking registrar and registration ownership metadata.DomainRegistrar/registration profileDNS Check
Trust + Technical Standards

Built for production debugging, not vanity metrics

Every section balances actionable checks with transparent constraints so engineers can use outputs confidently in real incidents.

Transparent data-source strategy

Every check surfaces what can be validated from browser-safe signals vs resolver/provider-dependent data.

Tool + context in one URL

Each tool page combines first-fold execution, how-to guidance, and open FAQ content for operators and crawlers.

Readable output for incidents

Results are formatted for quick scanning, with structured follow-up paths to related tools and workflows.

No-account diagnostics

Core checks are available without signup to minimize friction during migrations and outage response.

Browser limitations and validation notes
  • Some HTTP/TLS details depend on target CORS behavior and browser fetch constraints.
  • Resolver and DNS cache variance can produce temporary regional answer differences during propagation windows.
  • Provider-specific logs remain the final authority for production-grade incident closure.
Availability
24/7 access
Architecture
Prerendered routes
Privacy
No signup required
Coverage
Tools + guides
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. The temporary noindex setting will be removed at domain launch.
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.

Open Tool Directory→Start DNS Workflow→Read Guides→