# CNAME Record Lookup

Follow a CNAME chain to its end, see every alias on the way, and find dangling CNAMEs that point at names that no longer exist (subdomain takeover risk).

Canonical: https://tamperbox.dev/cname-lookup

Reviewed: 2026-10-14

## Capabilities and processing

Enter a name or paste CNAME records (dig or zone file lines). A name is sent to our server, which asks a public resolver; pasted records are read in your browser.

The whole chain from a name to the record that holds addresses, with the TTL of each step. A target that does not exist is flagged as a dangling alias, the cause of subdomain takeovers, and a CNAME at the zone apex is flagged as invalid.

## Example workflow

The sample status page sits behind three aliases. Break it shows a dangling alias and a CNAME at the apex.

## Limits and interpretation

A long chain still works, but costs a lookup per step. Nothing is stored.

## Related tools

[All tools](https://tamperbox.dev/) · [Privacy](https://tamperbox.dev/privacy)