Scan all the TCP ports of a host

To perform a full TCP scan of our Metasploitable machine, 192.168.56.102, we add the command line option -p-. Substitute the IP address for your Metasploitable virtual machine:

nmap -p- 192.168.56.102

This command will scan all the TCP ports of the target device. The following is the output of our scan. You will notice that we have discovered some new open ports: