Domain Name System
"The Domain Name System (DNS) is a hierarchical decentralized naming system for computers, services, or any resource connected to the Internet or a private network."
Query system resolvers
dscacheutil -q host -a name github.com
- If you need a public address that resovles to localhost, you can use localtest.me
- If you need a globally resolvable hostname that point to any arbitrary ip address, use nip.io