DNS Tools

CNAME Lookup

See which hostname a subdomain such as www, shop or blog is aliased to with a CNAME record.

Not sure what to enter? Try an example: www.github.com

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Not Found

github.com

No CNAME records found for this domain.

Last checked: 0 seconds ago Live

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Result Summary

Passed

Domain resolves via DNS

Enter a subdomain to see the hostname its CNAME record points to - the usual way to connect www, a shop or a blog to a hosted platform.

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CNAME Lookup - www.github.com 0 seconds ago

What is a CNAME record?

A CNAME (canonical name) record makes one name an alias of another - for example www.example.com pointing to example.com, or shop.example.com pointing to a platform such as Shopify. The alias then uses whatever addresses the target name has.

How to look up a CNAME record

Enter the subdomain, for example www.example.com, in the box above.
Click Look Up CNAME.
Check the target is the host name your provider asked you to use.
Remember a name with a CNAME cannot hold other records, and the bare root domain usually cannot be a CNAME.

Related checks

To see the addresses the target resolves to, use the A Record Lookup.
To see every record type at once, use the DNS Lookup.

A CNAME that still points at a deleted service (an old CDN, app or storage bucket) can be taken over by someone else. Clean up aliases you no longer use, and let JustChecker tell you when a CNAME target changes.

Frequently Asked Questions

Not in standard DNS - the root domain (example.com) needs A records. Some DNS providers offer ALIAS, ANAME or "CNAME flattening" to get the same effect.

Usually www or shop, pointed at the hostname the platform gives you (for example shops.myshopify.com). Check it here once added to confirm it was saved correctly.

The name you entered probably uses A records instead, which is normal for root domains. CNAMEs exist only on the specific subdomains where you created them.

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