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  • MonitoringCertificate & Domain MonitorDaily checks of TLS certificates, domain registration and DNS, with alerts when a renewal fails.
  • AssessmentSecurity AssessmentA passive security report for a domain you own: TLS, DNS, email authentication, headers and registration.
Free tools
Start hereDomain Health CheckSSL, DNS, email authentication, security headers and expiry in one scored report.Run a health check →
Domain
  • Bulk Domain Expiry Checker
  • RDAP Domain Lookup
  • WHOIS Lookup
SSL / TLS
  • SSL Certificate Checker
  • Bulk SSL Expiry Checker
  • 47-Day Certificate Lifetime Calculator
  • Certificate Lifetime Readiness
  • Post-Quantum TLS Checker
DNS
  • DNS Lookup
  • MX Lookup
  • CAA Record Checker
  • DNS Propagation Checker
  • TXT Record Lookup
  • NS Lookup
  • CNAME Lookup
  • Reverse DNS Lookup
Email authentication
  • SPF Record Checker
  • SPF Record Generator
  • DMARC Record Checker
  • DMARC Record Generator
  • DKIM Record Checker
  • Email Sender Requirements Checker
Website security
  • Security Headers Checker
Network & IP
  • What Is My IP Address
  • Subnet Calculator
All free tools →
PricingDocsGuides
Log inStart free
  • MonitoringCertificate & Domain MonitorDaily checks of TLS certificates, domain registration and DNS, with alerts when a renewal fails.
  • AssessmentSecurity AssessmentA passive security report for a domain you own: TLS, DNS, email authentication, headers and registration.
Free tools
Start hereDomain Health Check
Domain
  • Bulk Domain Expiry Checker
  • RDAP Domain Lookup
  • WHOIS Lookup
SSL / TLS
  • SSL Certificate Checker
  • Bulk SSL Expiry Checker
  • 47-Day Certificate Lifetime Calculator
  • Certificate Lifetime Readiness
  • Post-Quantum TLS Checker
DNS
  • DNS Lookup
  • MX Lookup
  • CAA Record Checker
  • DNS Propagation Checker
  • TXT Record Lookup
  • NS Lookup
  • CNAME Lookup
  • Reverse DNS Lookup
Email authentication
  • SPF Record Checker
  • SPF Record Generator
  • DMARC Record Checker
  • DMARC Record Generator
  • DKIM Record Checker
  • Email Sender Requirements Checker
Website security
  • Security Headers Checker
Network & IP
  • What Is My IP Address
  • Subnet Calculator
All free tools →
PricingDocsGuides
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  3. /Domain

Free Domain tools

Check a domain's overall health and when its registration expires, straight from registry data.

Domain reports

  • Domain Health Check

    SSL, DNS, email authentication, security headers and expiry in one scored report.

Registration & WHOIS

  • Bulk · up to 20

    Bulk Domain Expiry Checker

    Registration expiry dates for up to 20 domains from RDAP registry data.

  • RDAP Domain Lookup

    Registration and expiry dates, registrar, status and nameservers from the registry.

  • WHOIS Lookup

    Registrar, creation and expiry dates, domain age, status codes and name servers for any domain.

Other categories

  • SSL / TLS
  • DNS
  • Email authentication
  • Website security
  • Network & IP
  • All free tools →
NetworkAI

Renewal-failure alerts for TLS certificates and domain registrations.

Product

  • Certificate monitor
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Free tools

  • Domain Health Check
  • SSL Certificate Checker
  • SPF Record Checker
  • DMARC Record Checker
  • Security Headers Checker
  • DNS Lookup
  • All free tools →

Tool categories

  • Domain
  • SSL / TLS
  • DNS
  • Email authentication
  • Website security
  • Network & IP

Resources

  • Documentation
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