Network Diagnostics and More
Tool guide limitationsGuides explain the intended workflow but cannot cover every device, provider or operating condition.

Interfaces and external services can change. Follow the current on-screen controls, check dates and vendor documentation, and verify important results independently before acting on them.

Important: Do not rely on this result alone for purchasing, configuration, security, safety, compliance, contractual or fault-diagnosis decisions. Results can be incomplete, delayed, misleading or wrong. Verify important findings with the relevant provider, manufacturer documentation and an appropriate independent test or qualified professional.

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Tool guides

Choose a tool to see what it does, how to use it, how to read the result, common problems, privacy notes, limitations and a worked example.

Connection tests

Technical diagnostics

DNS and email

Step-by-step guideDNS Lookup guideQuery public DNS record types, compare resolvers and review published DNS and email-security records.Read the DNS Lookup guide →Step-by-step guideEmail & DNS Toolkit guideChoose focused tools for SPF, DKIM, DMARC, headers, transport policy and DNS change preparation.Read the Email & DNS Toolkit guide →Step-by-step guideSPF Evaluator guideValidate an SPF policy and recursively inspect include and redirect branches.Read the SPF Evaluator guide →Step-by-step guideDKIM Validator guideInspect a published DKIM key and optionally verify a DKIM-Signature against an unmodified raw message.Read the DKIM Validator guide →Step-by-step guideDMARC Report Reader guideRead aggregate DMARC XML reports locally and summarise authentication outcomes.Read the DMARC Report Reader guide →Step-by-step guideEmail Header Analyser guideInspect local message headers for relay order, delays, authentication and spoofing indicators.Read the Email Header Analyser guide →Step-by-step guideEmail Domain Health guideRun a passive public-DNS and HTTPS-policy audit without an SMTP server.Read the Email Domain Health guide →Step-by-step guideDNSSEC & DANE guideReview DNSSEC chain evidence, DS matching and published TLSA records.Read the DNSSEC & DANE guide →Step-by-step guideEmail DNS Configuration Preflight guideCompare proposed email DNS records with the currently published values before a change.Read the Email DNS Configuration Preflight guide →Step-by-step guideDNS, TLS & Policy Monitor guideRepeat selected public DNS and policy checks while the page remains open.Read the DNS, TLS & Policy Monitor guide →Step-by-step guideEmail Record Generators & Bulk DNS guideCreate reviewable SPF/DMARC starting points and perform grouped public DNS lookups.Read the Email Record Generators & Bulk DNS guide →Step-by-step guideAuthoritative DNS Trace guideVisualise public delegation and DNSSEC evidence from the root and TLD levels through the requested name.Read the Authoritative DNS Trace guide →

Insights and reports

Step-by-step guideDiagnostic Case Workspace guideGroup exports and notes from multiple diagnostic tools into one browser-local case, surface possible cross-tool relationships and retain reusable encrypted projects.Read the Diagnostic Case Workspace guide →Step-by-step guideConnection Comparison guideCompare two locally saved speed tests side by side.Read the Connection Comparison guide →Step-by-step guideReliability Monitor guideSample browser-to-site availability and response time for a chosen period.Read the Reliability Monitor guide →Step-by-step guideNetwork Health Summary guideCombine recent local measurements and current checks into a transparent weighted summary.Read the Network Health Summary guide →Step-by-step guideSupport Report guideCombine selected local measurements and notes into a privacy-redacted support report.Read the Support Report guide →Step-by-step guideGuided Troubleshooting guideFollow an ordered workflow for common network, email, firewall or security symptoms.Read the Guided Troubleshooting guide →Step-by-step guideService Health guideReview current hosted-component availability and visitor-observed recent history.Read the Service Health guide →Step-by-step guideNetwork Change Comparison guideCompare before and after text or JSON snapshots locally, with best-effort secret redaction.Read the Network Change Comparison guide →Step-by-step guideShareable Status Report guideCreate a small public service-status report with an automatic expiry and no account.Read the Shareable Status Report guide →

Planning

Utilities