How to use this tool
- Enter a hostname such as example.com without a URL scheme, path or port.
- Run the lookup to request A and AAAA records from the same resolver.
- Read each address family separately. Copy a returned address into IP lookup for network details.
Why can one hostname have several addresses?
A service may use several servers, a content-delivery network or load balancing. DNS can return a set of addresses, and that set can change between queries. The browser decides which route to try; this lookup does not reproduce every part of that decision.
A name can point through a CNAME alias before producing an A or AAAA answer. An address may belong to a shared CDN rather than the company operating the website. IP ownership and website ownership are different questions.
What if IPv6 is missing?
No AAAA answer means this resolver returned no IPv6 record for this name at this time. It does not tell you whether your own network supports IPv6. Likewise, seeing an AAAA record does not prove your browser can reach that destination over IPv6.
Use A answers for IPv4 comparisons and AAAA answers for IPv6 comparisons. A successful DNS lookup does not test HTTP, certificates, application health or whether a firewall allows a connection.
Which resolver does this tool use?
Both queries go from our server to Cloudflare's 1.1.1.1 DNS-over-HTTPS service. The result identifies that resolver and records the check time. Your operating system or browser may use a different resolver and may have a cached answer.
For MX, TXT, CAA and other record types, use DNS lookup. If you start with an IP rather than a hostname, use reverse DNS to request its PTR name.