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  • Security Headers Checker
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  • What Is My IP Address
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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 →
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  3. /DNS

Free DNS tools

Look up any DNS record, check propagation across public resolvers, and see which certificate authorities a domain allows.

Record lookups

  • DNS Lookup

    A, AAAA, CNAME, MX, NS, TXT, CAA and SOA records in one view.

  • MX Lookup

    Mail servers in priority order, what they resolve to, and the provider behind them.

  • TXT Record Lookup

    Every TXT record on a domain, with SPF, DMARC and verification tokens labelled.

  • NS Lookup

    A domain's name servers, their IP addresses, and whether each one answers with the same zone.

  • CNAME Lookup

    Follow a CNAME chain hop by hop to the final hostname and its IP addresses.

  • Reverse DNS Lookup

    The PTR hostname for an IPv4 or IPv6 address, and whether it resolves back to the same IP.

Propagation

  • DNS Propagation Checker

    See whether 20 public DNS resolvers return your new A, MX, TXT or CNAME record yet.

Security records

  • CAA Record Checker

    Which certificate authorities may issue for a domain, including inherited rules.

Other categories

  • Domain
  • SSL / TLS
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Renewal-failure alerts for TLS certificates and domain registrations.

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Free tools

  • Domain Health Check
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  • Security Headers Checker
  • DNS Lookup
  • All free tools →

Tool categories

  • Domain
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  • Email authentication
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  • Network & IP

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