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DNS lookup Mail server DNSSEC SPF

DNS lookup Every record type, with its TTL and the DNSSEC validation state. Propagation The same question asked of five public resolvers and of your authoritative servers. Reverse lookup From an IP address to its name, and a check that the round trip agrees. Domain record Availability, registrar, dates and locks, read from the registry RDAP. Punycode / IDN Conversion both ways, with detection of look-alike characters. Mail server MX, reverse DNS, FCrDNS, open ports, SMTP banner and the certificate served. SPF Analysis and generation, with the real count of DNS lookups triggered. DKIM Public key readout, length, algorithm and detection of revoked keys. DMARC Policy readout, guided generation and validation of report recipients. MTA-STS Policy, TXT record and a check that the policy is actually being served. Email headers Path taken, delays, authentication results. Analysed in your browser. DNSSEC DS to DNSKEY chain, algorithms in use and confirmation that validation holds. CAA Which authorities may issue a certificate for this domain, and generation. SEO and AI visibility Tags, robots.txt, sitemap, security headers and the policy towards AI crawlers.

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Reverse lookup

From an IP address to its name, and a check that the round trip agrees.

IP address or hostname

An IP address gives the reverse direction; a name gives its addresses then their PTR.

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No diagnostic data kept beyond a five-minute cache.

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