ARPA Host Name Server Protocol
Appearance
The ARPA Host Name Server Protocol (NAMESERVER), is an obsolete network protocol used used in translating a host name to an Internet address. IANA allocated udp and tcp port 42 for NAMESERVER; this port is more commonly used by the Windows Internet Name Service (WINS) on Microsoft operating systems.
Support
The NAMESERVER protocol is used by the DARPA Trivial Name Server, a server process still provided in some implementations of UNIX.
Replacement
Support for the NAMESERVER protocol has been deprecated, and may not be available in the latest implementations of all UNIX operating systems. The Domain Name System (DNS) has replaced the ARPA Host Name Server Protocol and the DARPA Trivial Name Server.