ncat command examples

ncat – Concatenate and redirect sockets

Connect to example.org on TCP port 8080.

#ncat example.org 8080

Listen for connections on TCP port 8080.

#ncat -l 8080

Redirect TCP port 8080 on the local machine to host on port 80.

$ncat --sh-exec "ncat example.org 80" -l 8080 --keep-open

Bind to TCP port 8081 and attach /bin/bash for the world to access freely.

#ncat --exec "/bin/bash" -l 8081 --keep-open

Bind a shell to TCP port 8081, limit access to hosts on a local network, and limit the maximum number of simultaneous connections to 3.

#ncat --exec "/bin/bash" --max-conns 3 --allow 192.168.0.0/24 -l 8081 --keep-open

Connect to smtphost:25 through a SOCKS4 server on port 1080.

#ncat --proxy socks4host --proxy-type socks4 --proxy-auth user smtphost 25

Create an HTTP proxy server on localhost port 8888.

#ncat -l --proxy-type http localhost 8888

Send a file over TCP port 9899 from host2 (client) to host1 (server).

HOST1$ ncat -l 9899 > outputfile

HOST2$ ncat HOST1 9899 < inputfile

Transfer in the other direction, turning Ncat into a “one file” server.

HOST1$ ncat -l 9899 outputfile