DNS Esoterica -- Why you can't dig Switzerland
“Internet”, obviously. Wait… Isn’t the DNS on the Internet? Why do we need to specify that these DNS records are for Internet?
Well, isn’t it obvious? Because you might want records of a different network. Like, for example, Chaosnet.
Source: DNS Esoterica – Why you can’t dig Switzerland – Terence Eden’s Blog
I had no idea that DNS can handle networks other than the Internet.