Check where a CNAME alias points and follow the chain to its final address
Runs in your browser. Only the lookup you start is sent to cloudflare-dns.com or dns.google; nothing else leaves your device. Updated on 25 Oct 2026.A CNAME lookup shows where an alias points. A CNAME makes one name an alias of another, the usual way a subdomain is pointed at a CDN, a store builder or a mail provider. Type the subdomain, such as www or shop, to see the name it points to and the TTL.
Keep CNAME selected in the Record type list, as the page opens with it.
Type the subdomain, such as www.github.com, and press Look up.
Read the target name in the Data column and its TTL.
Change Record type to A to follow the alias chain to the final IPv4 address.
Switch to A to follow the whole chain to an address. A bare domain such as example.com normally cannot be a CNAME, so ask for its subdomain.
This DNS lookup asks a public resolver, Cloudflare 1.1.1.1 or Google 8.8.8.8, the same question dig or nslookup would, and shows the answer in a table. Pick one record type, or "All common types" to ask for A, AAAA, CNAME, MX, NS, TXT, SOA, CAA and HTTPS together. Every record shows its TTL in seconds and in words, because the TTL is how long any copy of it may be cached.
When a name is an alias, the CNAME chain is shown before the final records. The answer also says plainly when the name does not exist (NXDOMAIN), when the resolver could not get an answer (SERVFAIL), or when the name exists but has none of the type you asked for.
A browser cannot send DNS packets itself, so the page uses DNS over HTTPS. The name you type goes to the resolver you chose, which is how it gets an answer; nothing else about you or your other searches is sent. You see what that resolver has in its cache, which can lag a recent change by up to the record's TTL. To compare two resolvers side by side, use the DNS Propagation Checker.
The rest of the article, and all 6 questions about DNS Lookup, are on the DNS Lookup page.
Yes. No signup and no limit on how many names you look up. Each lookup is one request from your browser to Cloudflare or Google, both of which run their public resolvers free of charge. The page is supported by a few ads shown outside the tool.
NXDOMAIN is the DNS answer for a name that does not exist at all, for any record type. Common causes are a typo, a subdomain that was never created, or a domain that has expired. A name that exists but lacks the type asked for gets a different answer: no records.
SERVFAIL means the resolver tried and could not get a trustworthy answer. Either the domain's own name servers did not reply, or the answer failed DNSSEC validation. The DNS Propagation Checker asks again with DNSSEC checking off, which shows which of the two it is.
No. DNS answers questions about names you already know; there is no query that lists every name in a zone, and zone transfers are refused by almost every public server. Certificate transparency logs are the usual way to discover subdomains, and this tool does not search them.
Still stuck? Ask about DNS Lookup and anybody who knows can answer. No account needed.
Same job, other tools: AS Number Lookup – Turn an AS number into the network name, registry and allocation date · IP to ASN Lookup – Map an IP address to the ASN that announces it, with the BGP prefix.
On the related tools: Open Port Checker – See if a port forwarded on your router is reachable from the internet.