Inspect DNS, TLS, email, HTTP behaviour, website performance or a public port right now.
Free diagnostic tools · no account required
Free tools for the checks you need right now.
Check DNS, SSL, email delivery, WHOIS, hosting, redirects, headers, robots.txt, sitemaps, ports and website performance from one public workspace. No account required for a quick diagnostic check.
Fast public checks
DNS, SSL, redirect, headers, port, and performance — no jumping between tabs.
Safer target handling
Private, local, and reserved targets are blocked before any request runs.
One-click monitor handoff
Turn any result into a Dashmon monitor with the target already prefilled.
Free diagnostic tools
Check once for free. Monitor continuously when it matters.
These tools are built for quick public diagnostics without creating an account. When a result represents something you need to keep watching, Dashmon can turn that one-off check into ongoing monitoring.
Keep watching the target, build history and receive an operational signal when its state changes.
DNS & certificates
DNS Lookup
Check A, AAAA, CNAME, MX, TXT, NS, SOA, and CAA records, then move straight into DNS monitoring.
Run a lookup to see normalized records, TTLs, and a direct path into a DNS monitor.
DNS & certificates
SSL Checker
Review issuer, SAN values, validity dates, and protocol details before moving into certificate monitoring.
Run an SSL check to see expiry, issuer, SANs, and a certificate-monitor CTA.
DNS, domain & email
Email Delivery Quick Check
Review MX records, SPF, DMARC, optional DKIM selector checks, and lightweight SMTP reachability.
Run a check to see whether MX, SPF, DMARC, and optional DKIM look healthy, plus SMTP reachability.
DNS, domain & email
WHOIS / Registrar Details
Look up public registration data — registrar, creation and update dates, registry statuses, nameservers, and expiry window.
Run a WHOIS-style lookup to see registrar, dates, registry statuses, nameservers, and expiry risk.
DNS, domain & email
IP / ASN / Hosting Lookup
Resolve a hostname, URL, or IP to its address, ASN, provider hints, reverse DNS, and CDN / proxy edge signals.
Run a lookup to see the public IP, ASN, provider hints, reverse DNS, and CDN signals.
Website & SEO
Redirect Checker
Trace redirect hops, status codes, and the final destination without leaving the page.
Run a redirect check to trace hop-by-hop behavior and the final destination.
Website & SEO
Headers Checker
Inspect response headers, security hints, caching details, and edge behavior in one pass.
Run a headers check to inspect cache, security, and response metadata quickly.
Website & SEO
robots.txt Checker
Fetch robots.txt, preview the contents, and surface sitemap references from the same page.
Run a robots check to preview robots.txt, fetch status, and sitemap references.
Website & SEO
Sitemap Checker
Validate that a sitemap or sitemap index is reachable and structurally healthy.
Run a sitemap check to validate accessibility, kind, child counts, and a quick preview.
Network
Port Checker
Run a bounded TCP reachability check from Dashmon's isolated public-tools lane.
Run a bounded TCP check to see open, timeout, or closed-style results in one table.
Website & SEO
Website Performance
Measure redirects, DNS time, connection time, TLS time, TTFB, download time, and total response time.
Queue a lightweight performance check to see timing breakdowns and redirect-aware totals.
Turn results into monitoring
Run a check now. Keep watching it in Dashmon.
Every supported result can move straight to a prefilled monitor. The draft keeps the target and recommended settings through login for up to 30 minutes, so one-time troubleshooting can become ongoing visibility without retyping the evidence.