DNS Lookup

Dig-style lookup for A, AAAA, MX, TXT, NS, SOA, SRV, CAA, PTR — plus subdomain sweep.

For PTR (reverse) lookups, enter an IPv4 address, e.g. 8.8.8.8

Related tools

DNS PropagationQuery one record across Google, Cloudflare, Quad9 and OpenDNS to spot propagation lag.WHOIS LookupRegistration, registrar, dates and nameservers for a domain (live WHOIS).SPF CheckerFetch and validate a domain's SPF record, with the 10-lookup limit in mind.DMARC CheckerRead and explain a domain's DMARC policy (p, rua, pct, alignment).IP InfoReverse DNS plus ASN, network and country for an IP (via Team Cymru).

Frequently asked questions

What is a DNS lookup?

A DNS lookup asks the Domain Name System what records a name publishes — for example the A record (IPv4 address), MX records (mail servers) or TXT records (SPF, DKIM, verification). It is the web equivalent of the classic dig command.

Which DNS record types can I query?

A, AAAA, CNAME, MX, NS, TXT, SOA, SRV, CAA and PTR (reverse). You can also run "All common records" in one query, or a subdomain sweep of standard names like www, mail and autodiscover.

Why do different resolvers return different answers?

DNS answers are cached for a period set by each record's TTL. Right after a change, some resolvers may still serve the old value until their cache expires. Comparing Google, Cloudflare and Quad9 shows how far a change has propagated.

How do I do a reverse DNS (PTR) lookup?

Choose the PTR record type and enter an IPv4 address such as 8.8.8.8. The tool builds the in-addr.arpa name and returns the host name that address points to.