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# nc
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> A versatile utility for working with TCP or UDP data.
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> Netcat is a versatile utility for redirecting IO into a network stream.
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> More information: <https://manned.org/man/nc.1>.
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- Establish a TCP connection:
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- Start a listener on the specified TCP port and send a file into it:
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`nc {{ip_address}} {{port}}`
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`nc -l -p {{port}} < {{filename}}`
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- Set a timeout:
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- Connect to a target listener on the specified port and receive a file from it:
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`nc -w {{timeout_in_seconds}} {{ipaddress}} {{port}}`
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`nc {{host}} {{port}} > {{received_filename}}`
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- Scan the open TCP ports of a specified host:
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`nc -v -z {{ip_address}} {{port}}`
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`nc -v -z -w {{timeout_in_seconds}} {{host}} {{start_port}}-{{end_port}}`
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- Listen on a specified TCP port and print any data received:
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- Start a listener on the specified TCP port and provide your local shell access to the connected party (this is dangerous and can be abused):
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`nc -l {{port}}`
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`nc -l -p {{port}} -e {{shell_executable}}`
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- Keep the server up after the client detaches:
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- Connect to a target listener and provide your local shell access to the remote party (this is dangerous and can be abused):
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`nc -k -l {{port}}`
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- Listen on a specified UDP port and print connection details and any data received:
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`nc -u -l {{port}}`
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`nc {{host}} {{port}} -e {{shell_executable}}`
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- Act as a proxy and forward data from a local TCP port to the given remote host:
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`nc -l {{local_port}} | nc {{hostname}} {{remote_port}}`
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`nc -l -p {{local_port}} | nc {{host}} {{remote_port}}`
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- Send an HTTP GET request:
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`echo -e "GET / HTTP/1.1\nHost: {{hostname}}\n\n" | nc {{hostname}} 80`
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`echo -e "GET / HTTP/1.1\nHost: {{host}}\n\n" | nc {{host}} 80`
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