DNS
Query DNS records, check nameservers and DNSSEC, compare public resolvers and inspect reverse DNS and CAA.
6 toolsFree, no sign-up
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DNS Lookup
Query A, AAAA, MX, TXT, NS, SOA, CAA and other records for any hostname through public DNS resolvers.
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Nameserver Checker
Review a domain's delegated nameservers: count, addresses, network diversity, IPv6 reachability and SOA.
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DNSSEC Checker
Check whether a domain is DNSSEC-signed, whether its DS and DNSKEY records match and whether it validates.
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DNS Resolver Comparison
Ask several public recursive resolvers the same DNS question and see whether their cached answers agree.
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Reverse DNS
Look up PTR records for an IP address or a domain's addresses and confirm they resolve forward again.
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CAA Checker
See which certificate authorities a domain allows to issue SSL/TLS certificates, including wildcard rules.