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   ncat    ( 1 )

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CONNECT MODE AND LISTEN MODE

Ncat operates in one of two primary modes: connect mode and
       listen mode. Other modes, such as the HTTP proxy server, act as
       special cases of these two. In connect mode, Ncat works as a
       client. In listen mode it is a server.

       In connect mode, the hostname and port arguments tell what to
       connect to.  hostname is required, and may be a hostname or IP
       address. If port is supplied, it must be a decimal port number.
       If omitted, it defaults to 31337.

       In listen mode, hostname and port control the address the server
       will bind to. Both arguments are optional in listen mode. If
       hostname is omitted, it defaults to listening on all available
       addresses over IPv4 and IPv6. If port is omitted, it defaults to
       31337.