Blacklist Check
Is the IP listed on the major DNSBL zones mail servers consult?
Enter a target
Enter a mail server IP address to check the major blocklists.
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. HTTP HeadersStatus code, redirect chain, response time and security headers. Port CheckIs a TCP port reachable from the outside? Tells closed apart from filtered. Reverse DNSPTR record, forward-confirmed check and the network the address belongs to.