Free tools to inspect DNS records, check propagation, scan ports, geolocate IPs, troubleshoot HTTP, SSL, SMTP, and FTP errors, and explore TLD data. No signup required.
Inspect, verify, and troubleshoot DNS records and propagation for any domain.
Look up A, AAAA, MX, NS, TXT, CNAME, SOA, and CAA records for any domain. Full DNS record analysis with DNSSEC validation status.
Open ToolCheck how DNS changes are propagating across global servers in real-time. Monitor nameserver updates, TTL countdown, and resolution consistency worldwide.
Open ToolLook up domain ownership, registration history, expiry dates, and browse expiring domains.
Look up domain registration details — registrar, nameservers, creation and expiry dates, and domain status codes from WHOIS/RDAP data.
Open ToolCheck when a domain was first registered and calculate its exact age. Useful for SEO analysis, trust assessment, and domain valuation.
Open ToolCheck when a domain expires and whether auto-renew is enabled. Monitor expiry dates to avoid accidental domain loss.
Open ToolFind all domains registered by an owner, registrar, or nameserver. Discover domain portfolios and brand assets.
Open ToolLook up WHOIS data for multiple domains at once. Export results as CSV for portfolio management and competitive analysis.
Open ToolBrowse domains expiring soon across all TLDs. Filter by TLD, age, and length to find valuable dropping domains.
Open ToolSearch 20M+ domains for sale across major aftermarket platforms. Compare prices and find your perfect domain.
Open ToolAudit on-page SEO, inspect HTTP responses, trace redirect chains, check robots.txt files, and analyze TLS certificates.
Comprehensive on-page SEO audit analyzing 70+ ranking factors — meta tags, headings, structured data, keyword density, image optimization, link validation, robots.txt access, and AI search readiness.
Open ToolFetch and validate any site's robots.txt file. Check for correct content-type, detect HTML responses, and parse User-agent blocks, Disallow/Allow rules, and Sitemap directives.
Open ToolInspect any URL with a full timing waterfall — DNS lookup, TCP connect, TLS handshake, and time to first byte. View TLS certificate details, request/response headers, and body metadata.
Open ToolTrace HTTP redirect chains hop by hop in real-time. Detect redirect loops, view status codes and timing per hop, and see the final destination URL. Supports 301, 302, 303, 307, and 308 redirects.
Open ToolTest email deliverability, validate authentication records, and diagnose mail server issues.
Test your email setup with a spam score from 0 to 10. Checks SPF, DKIM, DMARC, reverse DNS, and more to ensure inbox delivery.
Open ToolFind mail exchange servers for any domain with priority, PTR records, and provider detection.
Open ToolValidate SPF records with DNS lookup count, mechanism analysis, and actionable fix suggestions for authentication failures.
Open ToolVerify DKIM signatures, check key strength, and validate DNS records for email authentication.
Open ToolAnalyze DMARC policy configuration, reporting addresses, and alignment settings for your domain.
Open ToolTest mail server connectivity, TLS support, and SMTP response codes with a live connection test.
Open ToolTrace the delivery path of any email — see hops, delays, authentication results, and security analysis.
Open ToolScan ports, geolocate IPs, detect threats, and diagnose server and protocol errors.
Scan TCP and UDP ports on any IP or domain. Audit cloud infrastructure, find exposed services, check firewall rules, and map your attack surface from outside your network.
Open ToolFind the physical location, ISP, ASN, and organization for any IP address. Includes threat intelligence — detect VPNs, proxies, Tor exit nodes, and cloud hosting.
Open ToolDetect your public IP address instantly. See your geolocation, ISP, and security assessment including VPN/proxy detection and threat reputation.
Open ToolCheck if a domain or IP address is listed on email and spam blacklists (DNSBLs). Scan 50+ blacklists in real-time to diagnose email deliverability issues and reputation problems.
Open ToolCheck if any URL, domain, or IP is flagged for malware, phishing, or spam across 17 security vendors — Google Safe Browsing, threat intelligence feeds, and DNS blocklists. Get remediation guidance for flagged sites.
Open ToolAnalyze security headers for any website and get a grade from A+ to F. Generate production-ready configs for Nginx, Apache, Cloudflare, Caddy, Vercel, and Next.js.
Open ToolDiagnose and fix Cloudflare 5xx origin errors and 1xxx Cloudflare-layer errors. Step-by-step troubleshooting with causes ranked by likelihood and CLI commands.
Open ToolComplete reference of HTTP status codes from 1xx to 5xx. Understand what each code means, when it occurs, common causes, and step-by-step fixes.
Open ToolDiagnose SSL certificate errors, TLS handshake failures, and OpenSSL errors. Troubleshooting guides with openssl commands and certificate chain analysis.
Open ToolTroubleshoot email delivery failures with SMTP error code reference. Covers 2xx-5xx responses with DNS record checks, authentication fixes, and relay diagnostics.
Open ToolDiagnose FTP file transfer errors with complete reply code reference. Covers 1xx-5xx responses with active vs passive mode fixes, firewall diagnostics, and authentication troubleshooting.
Open ToolConverters and references for common developer tasks — timestamps, encoding, and more.
Server administration references and guides.
Live data on TLD registries, DNS providers, domain companies, marketplaces, and security findings — updated daily from zone file analysis.
Browse 1,900+ top-level domains with registry details, DNSSEC status, DNS provider breakdown, and registration pricing.
Open ToolLive rankings of TLDs by domain count, DNS providers by market share, and DNSSEC adoption rates. Updated daily.
Open ToolRegistration density for 1-12 character domain names across TLDs. See where short domains are still available.
Open ToolDNS hosting providers ranked by market share with TLD breakdown, parent company details, and infrastructure data.
Open ToolRegistry operators and DNS holding companies with brand portfolios and consolidated market share data.
Open ToolAftermarket platforms with domain inventory counts, TLD breakdown, and parent company information.
Open ToolSecurity findings from daily analysis — typosquatted nameservers, lame delegations, provider concentration risks, and DNSSEC gaps.
Open Tool