DNS

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."

• https://en.wikipedia.org/wiki/List_of_DNS_record_types
• https://en.wikipedia.org/wiki/Category:Application_layer_protocols
• https://miek.nl/2009/july/31/dns-classes/

Query system resolvers

MacOS

dscacheutil -q host -a name github.com

Tips

• If you need a public address that resolves to localhost, you can use localtest.me
• If you need a globally resolvable hostname that point to any arbitrary ip address, use nip.io