Free DNS lookup tool. Query A, AAAA, MX, TXT, CNAME, NS, SOA, CAA, SRV, PTR, DS, DNSKEY, NAPTR, and TLSA records from your choice of resolver (Cloudflare, Google, Quad9, OpenDNS, or system), with real TTLs and optional DNSSEC validation. Runs from our London probe. Useful for DNS propagation checking, MX and CAA lookups, nameserver verification, and DNSSEC debugging.
DNS is the directory that turns a name like example.com into the addresses and settings other systems need. A single domain holds many record types: A and AAAA point at IPv4 and IPv6 addresses, MX names the mail servers, TXT carries SPF and verification strings, CNAME aliases one name to another, and NS and SOA describe the zone itself. This tool queries A, AAAA, MX, TXT, CNAME, NS, SOA, CAA, SRV, PTR, DS, DNSKEY, NAPTR, and TLSA records so you can see the full picture in one request.
You can run the query against Cloudflare, Google, Quad9, OpenDNS, or the system resolver, which matters when you are checking whether a change has spread. Every answer carries a TTL, the number of seconds a resolver may cache it before asking again, so a record with a 3600 TTL can stay stale for up to an hour after you edit it. If different public resolvers still disagree, the change simply has not propagated everywhere yet. The tool also supports optional DNSSEC validation for confirming a zone's cryptographic chain is intact.
A DNS lookup queries the Domain Name System to find the records attached to a domain, such as its A address, MX mail servers, or TXT strings. It is how a name is translated into the information other systems need.
Resolvers cache answers for the length of each record's TTL, so shortly after a change some resolvers still serve the old cached value while others have refreshed. This is normal DNS propagation and it clears once every cache expires.
TTL (time to live) is the number of seconds a resolver is allowed to cache a record before it must query again. A lower TTL makes changes take effect faster but increases query volume.
It can query A, AAAA, MX, TXT, CNAME, NS, SOA, CAA, SRV, PTR, DS, DNSKEY, NAPTR, and TLSA records, with live TTLs and optional DNSSEC validation.
