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CNAME Lookup
Run a CNAME lookup to reveal aliases and see how hostnames map to canonical domains, CDNs, and services. Verify routing, redirects, and DNS setups during migrations.
How to use this tool
- Enter the alias hostname and run a CNAME query.
- Inspect returned canonical targets and TTL values.
- Follow the target with A/AAAA checks when validating end-to-end resolution.
Alias validation
- Confirm onboarding hostnames for CDN and SaaS providers.
- Detect chained aliases that can increase DNS lookup latency.
- Spot missing or misconfigured canonical targets before launch.
Constraints to remember
- CNAME records cannot coexist with other record types at the same label.
- Zone apex hostnames typically require ALIAS/ANAME flattening instead.
- TTL changes apply after old cache entries expire.
FAQ
- Why cannot I set CNAME at the root domain?
- The DNS standard prohibits CNAME at the zone apex because SOA and NS records must also exist there.
- Do TTL updates take effect immediately?
- No. Recursive resolvers keep older TTL values until they expire, then fetch the new record state.
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