How to see all computers connected to a network

Arp-scan works great for me too...

If using Wi-Fi:

sudo arp-scan -l --interface=wlan0

-or if using ethernet:

sudo arp-scan -l --interface=eth0

(this last is practically identical to what Rajesh Rajendran posted; the -l standing for --localnet)

If you don't have arp-scan (it doesn't come with Ubuntu by default), just pull up a terminal and type:

sudo apt-get install arp-scan

Taken from Finding All Hosts On the LAN From Linux/Windows Workstation

for ip in $(seq 1 254); do ping -c 1 192.168.1.$ip>/dev/null; 
    [ $? -eq 0 ] && echo "192.168.1.$ip UP" || : ;
done

But for a great tool, Nmap. Great for mapping networks.

The simplest thing is

arp-scan --localnet

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