DNS Diagnostic

Deep-inspect any domain's DNS health — direct queries, no third-party APIs.

Also check for steiner-verlag.de

Registrar, expiry & ownership details

DNSSEC Validation

Chain of trust & signature verification

SPF, DKIM, DMARC & deliverability score

TLS Certificate

CT log history, SANs & cert details

DNS Propagation

Live check across global resolvers