What is a CNAME lookup?

It queries DNS for CNAME records and shows which canonical hostname an alias name points to.

What is a CNAME record?

A Canonical Name record maps one DNS alias to another hostname. Address records are looked up on the target, not the alias.

Apex CNAME is problematic at many providers due to RFC constraints and ANAME/ALIAS workarounds. Subdomains are the common case.

DNS standards say a CNAME at a name cannot coexist with most other record types on that same name.

Note the CNAME target from this tool, then run A or AAAA lookup on that target hostname.

Multiple consecutive CNAME aliases before reaching a name with A/AAAA. Each hop adds lookup steps and latency.

Common pattern: apex uses A/ALIAS records while www aliases to a CDN or apex hostname via CNAME.

MX should not point to CNAME targets. Mail-related names typically use direct A/AAAA or provider-specific records.

Certificate must cover the name users type. CNAME to a shared CDN host may need provider SSL provisioning.

This page shows only CNAME records for focused alias troubleshooting.

Follow provider guidance. Lower TTL before changes if you need faster rollback during CDN migrations.

The name may use A/AAAA directly, be the canonical target itself, or have no DNS published.

Yes. IP Checker Online provides CNAME lookups at no cost.

Yes. Cross-domain CNAME is valid when the target zone allows it and SSL is configured.

During CDN onboarding, subdomain setup, certificate issuance debugging, and after DNS migration.

DNS Tools

Find CNAME aliases and their target hostnames.