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Telnet is a client-server protocol, based on a reliable connection-oriented transport. Typically, this protocol is used to establish a connection to Transmission Control Protocol (TCP) port number 23, where a Telnet server application (telnetd) is listening. Telnet, however, predates TCP/IP and was originally run over Network Control Program (NCP) protocols.
An alternative way to get the server type it to make a TCP connection directly to the server on port 80, send a HEAD request, and see the response which will contain the server type if it is available. You can do this with telnet which is available on windows, mac, and unix systems.