Overview
Validate CNAME record configuration and check if a subdomain is properly pointed to its target destination.
How to Use
Enter the required information below. Results update in real-time with details about your configuration.
Enter a domain above and click Check CNAME
Example Use Cases
- Verify a subdomain CNAME points to the correct target after DNS migration
- Debug CDN or reverse-proxy setup by confirming CNAME resolution works
- Check custom domain configuration on GitHub Pages, Netlify, or Vercel
- Validate old CNAME records have been removed after decommissioning services
Common Issues
CNAME at apex: CNAME records cannot exist at the zone apex (bare domain). Use ALIAS/ANAME records or a CNAME flattening provider instead.
CNAME conflicts: A CNAME record cannot coexist with other record types for the same name. Remove conflicting A/AAAA records before adding a CNAME.