CNAME Lookup — Free & Instant

About this tool. A CNAME record makes one hostname an alias of another. They're everywhere — www pointing at an apex domain, DKIM selectors pointing at your email provider. This lookup shows exactly what a name aliases to.

Ten signals decide whether your mail arrives. You just checked one.

Mail providers hand out CNAMEs for DKIM keys and tracking domains, so a broken alias is a common cause of a signature that silently stops verifying.

SPF, DKIM, DMARC, MX and blocklist status, graded A to F in one pass
Every problem written out in plain English, with the record to publish
Saved under Reports, so you can re-run it and see what changed
One domain watched against the blocklists daily

Run the full checkup free

No card, and nothing to cancel.

How to read your CNAME results

A CNAME makes one hostname an alias for another. We follow the chain and show where it ultimately points.
A hostname with a CNAME cannot also have other records, which is why the apex of a domain usually cannot be a CNAME.

Common problems and how to fix them

A CNAME is not resolving

Make sure the target hostname exists and itself resolves. A CNAME to a dead name fails silently.

You need a CNAME at the root domain

Most DNS does not allow it. Use an A record, an ALIAS/ANAME record if your host offers one, or your CDN's flattening feature.

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Common questions.

What is a CNAME record?

A Canonical Name record that points one hostname to another, so both resolve to the same place.

Can the root domain be a CNAME?

Standard DNS does not allow a CNAME at the apex. Use A/AAAA records or an ALIAS-style record instead.