CNAME Lookup
Resolve CNAME (canonical name) records — see what a hostname is aliased to.
About the CNAME Lookup Tool
The CNAME Lookup tool resolves the canonical name (alias) for a hostname. A CNAME record maps one hostname to another — for example, `www.example.com` might be a CNAME pointing to `example.com`, and a marketing subdomain like `go.example.com` often CNAMEs to a HubSpot, Marketo or Klaviyo tracking host. CNAMEs are also central to SaaS onboarding: platforms like Shopify, Vercel, Netlify, Salesforce and Zendesk ask you to publish a CNAME so they can serve your custom subdomain on their infrastructure.
Because a CNAME simply says 'the real answer is at this other hostname', a resolver will chase the chain until it finds an A/AAAA record. This tool shows you both the CNAME target and the final IP address. Long CNAME chains — especially across CDNs and reverse proxies — can add latency, so seeing the chain is useful for performance debugging as well.
Common uses include validating a CDN cutover (e.g. is `www` still pointed at Cloudflare?), setting up SaaS custom domains, verifying a certificate-issuance CNAME challenge (used by AWS ACM, Let's Encrypt DNS-01), and confirming that a marketing subdomain resolves through your ESP correctly.
How to use this tool
- 1Enter the required value in the input field above (domain, IP, URL, or text depending on the tool).
- 2Click the action button to run the check — results are computed instantly from our edge network.
- 3Review the parsed output, key fields and any warnings shown in the result card.
- 4Copy the result, share the page URL, or jump to a related tool from the sidebar to continue debugging.
Key features
- Resolves CNAME target and follows the chain
- Detects CNAME chains that add latency
- Great for validating SaaS custom domains
- Useful for ACME DNS-01 certificate challenges