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CNAME Lookup
A CNAME record makes one name an alias of another, so it follows the target's addresses wherever they move. Look up where a subdomain points — typically a CDN, a hosted app, or a target a service asked you to create.
About CNAME records
What the answer tells you
- A name with a CNAME can have no other records of any type, which is why the apex of a domain (example.com itself) normally cannot be one.
- Resolvers follow alias chains for you. This lookup shows the name the alias points at directly.
- Many services verify a custom domain by checking for a CNAME to a name they control.
www.example.com. 3600 IN CNAME example.com.
Record types
Look up any record type
Each type has a page of its own, explaining what the record does and what to look for in the answer.
- AA Record LookupIPv4 address
- AAAAAAAA Record LookupIPv6 address
- CNAMECNAME LookupAlias
- MXMX LookupMail servers
- TXTTXT Record LookupText, SPF and DMARC
- NSNS LookupNameservers
- SOASOA Record LookupZone authority
- CAACAA Record LookupCertificate authorities
- SRVSRV Record LookupService locations
- PTRReverse DNS LookupReverse DNS (PTR)
Questions
Frequently asked questions
- Why can't I add a CNAME at my root domain?
- The apex must carry SOA and NS records, and a CNAME cannot coexist with anything else. Many DNS providers offer an ALIAS or flattened CNAME that behaves the same way while publishing ordinary A records.
- The lookup finds no CNAME, but the name resolves
- Then the name has A or AAAA records of its own rather than an alias. Look it up as an A record to see its addresses.
- What is DNS propagation?
- DNS does not push changes out. Each resolver keeps an answer for its TTL and only asks again once that runs out, so after a change different resolvers return old and new answers for a while. When every column here agrees with the authoritative one, the change has reached them.
- What does the authoritative column show?
- The answer from one of the domain's own nameservers, which never comes from a cache. It shows what the zone says right now; the resolver columns show what the internet has cached.