Double check the video about a basic example on how to use the toolkit “nmap“, this powerful tool that comes pre-installed on Kali Linux and let you scan an entire network if you want to.
If you don’t have the tool already installed, use the specific commands for your distribution to install it,
# yum install nmap for RHEL / CentOS distros. and
# apt-get install nmap for Ubuntu / Debian distros.
Check the video: https://bit.ly/2IJTk3v