CNAME Lookup
Resolve CNAME (canonical name) records — see what a hostname is aliased to.
Ready to Analyze
Enter a target value above or click any sample preset chip to generate real-time diagnostic output.
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.
Enter the required value in the input field above (domain, IP, URL, or text depending on the tool).
Click the action button to run the check — results are computed instantly from our edge network.
Review the parsed output, key fields and any warnings shown in the result card.
Copy the result, share the page URL, or jump to a related tool from the sidebar to continue debugging.
- 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