netdiscover -i eth0
netdiscover -r 10.11.1.1/24

nmap -sn 10.11.1.1/24
nmap -sn 10.11.1.1-253
nmap -sn 10.11.1.*

nbtscan -r 10.11.1.1/24

for i in {1..254} ;do (ping -c 1 172.21.10.$i | grep "bytes from" &) ;done

for /L %i in (1,1,255) do @ping -n 1 -w 200 172.21.10.%i > nul && echo 192.168.1.%i is up.