HTTP Headers
Status code, redirect chain, response time and security headers.
Enter a target
Enter a hostname to see the status code, redirect chain and security headers.
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. SSL CertificateValidity, hostname match, issuer and chain, read straight from the handshake. 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.