SSL Certificate
Validity, hostname match, issuer and chain, read straight from the handshake.
Enter a target
Enter a hostname to read its certificate straight from the TLS handshake.
Other tools
DNS LookupA, AAAA, CNAME, MX, TXT, NS, SOA and CAA records with their TTL values. DNS PropagationCompare what different resolvers answer for the same record. Mail RecordsMX, SPF, DKIM and DMARC in one view, with the mistakes that silently lose mail. WHOISRegistrar, creation and expiry dates, status codes and nameservers. HTTP HeadersStatus code, redirect chain, response time and security headers. Port CheckIs a TCP port reachable from the outside? Tells closed apart from filtered. Blacklist CheckIs the IP listed on the major DNSBL zones mail servers consult? Reverse DNSPTR record, forward-confirmed check and the network the address belongs to.