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nc

receive input on port 1337 nc -l 1337

receive input on port 1337 on GNU nc implementation nc -l -p 1337

receive input on port 1337 without hanging up after a connection nc -k -l 1337

send a file to the address 192.168.1.42 on port 1337 cat file | nc 192.168.1.42 1337

send a file to the address 192.168.1.42 on port 1337 with progress pv file | nc 192.168.1.42 1337

check if 127.0.0.1 is listening on port 80 but do not connect nc -vz 127.0.0.1 80

Basic Usage

Send what is read from stdin to an address and a port: nc

Send what is read from stdin to an address and a port on the GNU implementation of nc: nc

-p

Listen on a port and send it to stdout: nc -l

Listen on a port and send it to stdout on the GNU implementation of nc: nc -l -p

Compatibility

Usage for nc, or netcat, varies highly depending on your system. Some implementations require both the -l and -p flags to listen on a port, for instance, whereas others explicitly list using the -l and -p flags together is an error. Use these examples as a starting point, but turn to man for the specifics of your implementation.

nc

Netcat is a versatile utility for working with TCP or UDP data.
More information: https://nmap.org/ncat.

  • Listen on a specified port and print any data received:

    nc -l port

  • Connect to a certain port (you can then write to this port):

    nc ip_address port

  • Set a timeout:

    nc -w timeout_in_seconds ipaddress port

  • Serve a file:

    nc -l port < file

  • Receive a file:

    nc ip_address port > file

  • Server stay up after client detach:

    nc -k -l port

  • Client stay up after EOF:

    nc -q timeout ip_address

  • Scan the open ports of a specified host:

    nc -v -z ip_address port

  • Act as proxy and forward data from a local TCP port to the given remote host:

    nc -l local_port | nc hostname remote_port

To open a TCP connection from to of , with a timeout of

nc -p -w

To open a UDP connection to of :

nc -u

To open a TCP connection to port 42 of using as the IP for the local end of the connection:

nc -s

To create and listen on a UNIX-domain stream socket:

nc -lU /var/tmp/dsocket

To connect to of via an HTTP proxy at ,

. This example could also be used by ssh(1); see the ProxyCommand

directive in ssh_config(5) for more information.

nc -x: -Xconnect

The same example again, this time enabling proxy authentication with username "ruser" if the proxy requires it:

nc -x: -Xconnect -Pruser

To choose the source IP for the testing using the -s option

nc -zv -s source_IP target_IP Port