• Network & DNS

CNAME Checker

Look up CNAME records for any domain and trace the full chain of aliases.

Domain or URL only — e.g. example.com or https://example.com/page → checks example.com

• About this tool

What is CNAME Checker?

Look up CNAME records for any domain and follow the complete alias chain to the final A record. Identify CDN endpoints, third-party services, and misconfigured DNS.

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• FAQ

Frequently asked questions

What is a CNAME record?

A Canonical Name (CNAME) record maps a domain alias to another domain name. For example, www.example.com may CNAME to example.com or a CDN endpoint.

What is a CNAME chain?

A CNAME chain occurs when a CNAME points to another CNAME. Chains are valid but add DNS lookup latency.

What is a dangling CNAME?

A dangling CNAME points to a domain that no longer exists, creating a subdomain takeover vulnerability where an attacker can claim the target domain.

Can a root domain have a CNAME?

No. RFC 1912 prohibits CNAME records on a zone apex (root domain). Use ALIAS or ANAME records instead, depending on your DNS provider.

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