Free CNAME Lookup Tool
Check whether a hostname uses a visible CNAME alias, resolves directly with A or AAAA records, or likely relies on provider-side flattening.
Hostname alias check
Inspect CNAME aliases, direct records, and flattening hints
Paste a hostname or URL to see whether it aliases to another hostname with a CNAME, resolves directly with A or AAAA records, or likely uses provider-level flattening at the zone apex.
Status
Ready
CNAME present
No
CNAME records
0
A records
0
AAAA records
0
Score
0
Ready to inspect
Run a lookup to inspect hostname aliasing
You’ll get visible CNAME answers, final A and AAAA data, flattening hints, and plain-language diagnostics about how the hostname is actually resolving.
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Why use a CNAME lookup tool?
A CNAME lookup helps you understand whether a hostname is acting as an alias to another hostname. That matters for CDN setups, SaaS custom domains, tracking hosts, help centers, documentation portals, and any DNS workflow where one hostname should inherit routing from another target. A strong CNAME lookup is more useful than a simple DNS answer dump because it helps you distinguish three common realities: a true visible CNAME, a hostname that resolves directly with A or AAAA records, and a root domain that appears to be flattened by the DNS provider.
How to use this CNAME checker
Enter a hostname like www.example.com or paste a full URL. The tool normalizes that input to the hostname and then checks for CNAME, A, and AAAA records. If a CNAME exists, the results show the alias target and TTL values. If no CNAME exists but address records do, the tool explains whether the hostname is likely resolving directly or whether apex flattening may be in play. That helps you answer a more useful question than “is there a CNAME?” by itself. The real question is usually “how is this hostname actually being served?”
What the results mean
If a hostname returns a CNAME, that host is aliasing to another hostname and the final address answers will typically come from resolving that target. If a hostname returns A or AAAA records but no CNAME, it is resolving directly. That is normal for many hosts, especially root domains. If a root hostname has no visible CNAME but still behaves like it points at a platform, some DNS providers may be using ALIAS, ANAME, or CNAME flattening under the hood. That setup is common for CDN, hosting, and custom-domain products that need to support apex domains cleanly.
When a CNAME lookup is useful
Use a CNAME lookup when you are verifying a custom domain connection, debugging DNS propagation, checking whether a brand subdomain points to a SaaS vendor, investigating CDN or edge routing, or trying to understand why one hostname behaves differently from another. It is especially useful when a product asks you to add a CNAME for verification or publishing because you can quickly confirm whether the exact hostname is aliasing to the expected target.