To do so you can run: tar -xzvf netcat-0.7.1.tar.gzĬd to the directory containing the package's source code and type. configure to configure the package for your system. If you are getting error message like this - "no acceptable C compiler found in $PATH" when running. To install it type the following command: apt-get install build-essential configure command, make sure you have installed gcc compiler. Once configure has been successfully finished run: sudo make #Install netcat windows cmd install You can remove the program binaries and object files from the source code directory by typing make clean. To also remove the files that configure created, run make distclean command. How to use netcatīefore starting to explore some netcat commands it's important to know that if you are binding to well-known ports (0-1023) with nc, you need root privilege. Output if the 2424 port on remote server is closed nc: connect to 184.145.20.128 port 2424 (tcp) failed: Connection refused Test if a particular TCP port of a remote host is open nc -vn 184.145.20.128 2424 Otherwise, you can run nc as a normal user. SSH-2.0-OpenSSH_7.6p1 Ubuntu-4 2. Perform TCP port scanning against a remote host Output if the port on remote server is opened (e.g. Nc: connect to 184.145.20.128 port 25 (tcp) failed: Connection refused 3. Perform UDP port scanning against a remote host nc -vnzu 184.145.20.128 1-65535 Nc: connect to 184.145.20.128 port 24 (tcp) failed: Connection refused Nc: connect to 184.145.20.128 port 23 (tcp) failed: Connection refused Output will look like this nc: connect to 184.145.20.128 port 20 (tcp) failed: Connection refused The command below will check the ports from 20 to 25 on the remote host and print the result. Output will show only the ports which allow udp connections.
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