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DNS, email and security tools.

Every analyzer has its own dedicated page, URL and result view. Bookmark the tools you use most.

92Domain Security ScoreWeighted DNS, email and transport security posture.Open◎DNS LookupA, AAAA, MX, NS, TXT and CAA records.OpenSSPF AnalyzerSyntax, recursive includes and DNS-query limit.OpenKDKIM CheckerSelector, syntax and public key.OpenMDMARC AnalyzerPolicy, alignment and reporting.Open≡Header AnalyzerParse Received hops and authentication.OpenMXMX HealthMail exchanger and reverse-DNS checks.OpenBLBlacklist CheckIndicative DNSBL checks.OpenTLSMTA-STS / TLS-RPTSMTP transport-security policy and reports.OpenBBIMI CheckerAssertion record and logo URI.Open◈DNSSEC CheckDS and DNSKEY visibility.OpenSSLSSL / TLS InspectorCertificate issuer, names and expiry.OpenIPIP Reputation BasicsPTR, FCrDNS and DNSBL signals.Open
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DNS, email authentication and security tools

Use a dedicated SkullCheck page for each diagnostic. Individual URLs make results easier to revisit and give every tool a focused explanation of what it checks, what the signals mean and where configuration problems commonly occur.