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 or this site.
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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 ( )

C:\Program Files\Network\>ncat --help
Ncat 5.59BETA1 ( )
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.,, if the system had an IP address of 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.:

<title>Test Page</title>

<h1>Test Page</h1>

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


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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