ARPA Host Name Server Protocol

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The ARPA Host Name Server Protocol (NAMESERVER[1]), is an obsolete network protocol used in translating a host name to an Internet address. IANA Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) port 42 for NAMESERVER; this port is more commonly used by the Windows Internet Name Service (WINS) on Microsoft operating systems.


The NAMESERVER protocol is used by the DARPA Trivial Name Server, a server process called tnamed that is provided in some implementations of UNIX.[2][3][4]


Support for the NAMESERVER protocol has been deprecated, and may not be available in the latest implementations of all UNIX operating systems.[5] The Domain Name System (DNS) has replaced the ARPA Host Name Server Protocol and the DARPA Trivial Name Server.

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