tldr/pages/common/nc.md

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nc

A versatile utility for working with TCP or UDP data. More information: https://manned.org/man/nc.1.

  • Establish a TCP connection:

nc {{ip_address}} {{port}}

  • Set a timeout:

nc -w {{timeout_in_seconds}} {{ipaddress}} {{port}}

  • Scan the open TCP ports of a specified host:

nc -v -z {{ip_address}} {{port}}

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

nc -l {{port}}

  • Keep the server up after the client detaches:

nc -k -l {{port}}

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

nc -u -l {{port}}

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

nc -l {{local_port}} | nc {{hostname}} {{remote_port}}

  • Send an HTTP GET request:

echo -e "GET / HTTP/1.1\nHost: {{hostname}}\n\n" | nc {{hostname}} 80