sudo arp-scan --interface=eth0 --localnet
…where eth0 is your network interface.
You’ll find your network interface with:
ip a
If you want to exclude Unknown, then do:
sudo arp-scan --interface=enp0s31f6 --localnet | grep -vw Unknown
You can use nmap too:
nmap -sP 192.168.0.1/24
You have to use your real network ip and mask.(use command ip a)