Ncat 5.59BETA1 for Microsoft Windows

Ncat, which is a reimplementation of the netcat computer networking utility, is a utility which reads and writes data across a network from a command-line interface (CLI), such as a shell prompt or a Microsoft Windows command prompt. It supports TCP and UDP, SSL, and proxy connections via SOCKS4 or the HTTP CONNECT method.

You can downloaded a precompiled binary version of the utility from Nmap.org or this site.

Nmap.org
MoonPoint Support

You can check the version of the utility using the --version. You can obtain information on the options that the command supports by typing netcat --help.

C:\Program Files\Network\>ncat --version
Ncat: Version 5.59BETA1 ( http://nmap.org/ncat )

C:\Program Files\Network\>ncat --help
Ncat 5.59BETA1 ( http://nmap.org/ncat )
Usage: ncat [options] [hostname] [port]

Options taking a time assume seconds. Append 'ms' for milliseconds,
's' for seconds, 'm' for minutes, or 'h' for hours (e.g. 500ms).
  -4                         Use IPv4 only
  -6                         Use IPv6 only
  -C, --crlf                 Use CRLF for EOL sequence
  -c, --sh-exec <command>    Executes the given command via /bin/sh
  -e, --exec <command>       Executes the given command
  -g hop1[,hop2,...]         Loose source routing hop points (8 max)
  -G <n>                     Loose source routing hop pointer (4, 8, 12, ...)
  -m, --max-conns <n>        Maximum <n> simultaneous connections
  -h, --help                 Display this help screen
  -d, --delay <time>         Wait between read/writes
  -o, --output               Dump session data to a file
  -x, --hex-dump             Dump session data as hex to a file
  -i, --idle-timeout <time>  Idle read/write timeout
  -p, --source-port port     Specify source port to use
  -s, --source addr          Specify source address to use (doesn't affect -l)
  -l, --listen               Bind and listen for incoming connections
  -k, --keep-open            Accept multiple connections in listen mode
  -n, --nodns                Do not resolve hostnames via DNS
  -t, --telnet               Answer Telnet negotiations
  -u, --udp                  Use UDP instead of default TCP
      --sctp                 Use SCTP instead of default TCP
  -v, --verbose              Set verbosity level (can be used up to 3 times)
  -w, --wait <time>          Connect timeout
      --send-only            Only send data, ignoring received; quit on EOF
      --recv-only            Only receive data, never send anything
      --allow                Allow only given hosts to connect to Ncat
      --allowfile            A file of hosts allowed to connect to Ncat
      --deny                 Deny given hosts from connecting to Ncat
      --denyfile             A file of hosts denied from connecting to Ncat
      --broker               Enable Ncat's connection brokering mode
      --chat                 Start a simple Ncat chat server
      --proxy <addr[:port]>  Specify address of host to proxy through
      --proxy-type <type>    Specify proxy type ("http" or "socks4")
      --proxy-auth <auth>    Authenticate with HTTP or SOCKS proxy server
      --ssl                  Connect or listen with SSL
      --ssl-cert             Specify SSL certificate file (PEM) for listening
      --ssl-key              Specify SSL private key (PEM) for listening
      --ssl-verify           Verify trust and domain name of certificates
      --ssl-trustfile        PEM file containing trusted SSL certificates
      --version              Display Ncat's version information and exit

See the ncat(1) manpage for full options, descriptions and usage examples

C:\Program Files\Network\>

Creating a simple web server with ncat

You can have a Windows system function as a simple web server which serves just one web page using the command below:

ncat -lk -p 8080 --sh-exec "echo HTTP/1.1 200OK& echo(&type index.html"

If you want the server to listen on the well-known port for a web server, port 80, you can change the -p 8080, which causes ncat to listen on port 8080 to -p 80. You can test that the system is listening on that port by opening a browser on the same system and using http://localhost:8080 for the URL. Or you can test it from another system by using the IP address of the system on which ncat is listening, e.g., http://192.168.0.12, if the system had an IP address of 192.168.0.12. You can stop ncat from listening on the port by hitting Ctrl-C to terminate the program.

You could create a simple text file named index.html in the directory from which you run ncat to be served to browsers. E.g.:

<html>
<head>
<title>Test Page</title>
</head>

<body>
<h1>Test Page</h1>

<p>This is a test page.</p>

</body>
</html>

That page would then be displayed by a browser visiting http://localhost:8080 - you could substitute the IP address of the system, if you wished to access the ncat web server from an external system - if you used the ncat command shown above.

 

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