IP.THC.ORG — World’s Largest Internet Domain DatabaseFree Reverse DNS lookup, Subdomain finder, and CNAME lookup tool powered by a database of 5.49 billion+ indexed domains.Enable JavaScript to use the interactive search interface, or query the API directly:

Reverse DNS: curl https://ip.thc.org/1.1.1.1

Subdomains: curl https://ip.thc.org/sb/thc.org

CNAMEs: curl https://ip.thc.org/cn/github.io