The Internet uses the Domain Name System (DNS) to associate numeric computer IP addresses with human readable names.
The Domain Name System (DNS) is a hierarchical decentralized naming system for computers, services, or other resources connected to the Internet or a private network.
A grandfather clause (or grandfather policy) is a provision in which an old rule continues to apply to some existing situations while a new rule will apply to all future cases.
The Invisible Internet Project (I2P) is an anonymous network layer that allows for censorship-resistant, peer to peer communication.
MHSnet is a store-and-forward Message Handling System for wide area networks.
.bitnet was a pseudo-domain-style suffix used in the late 1980s when identifying a hostname not connected directly to the Internet but possibly reachable through inter-network gateways.
.csnet is a hostname suffix that was used for identifying nodes in the Computer Science Network (CSNET) not directly connected to the Internet but reachable through special gateway systems.
Networking device hostnames ending with.local are often employed in private networks, where they are resolved either via the multicast domain name service (mDNS) or local Domain Name System (DNS) servers.
.onion is a special-use top level domain suffix designating an anonymous hidden service reachable via the Tor network.
The name uucp was a pseudo-domain-style suffix used in the 1980s when identifying a hostname not connected directly to the Internet, but possibly reachable through other inter-network gateways.