The script below will loop in a subnet ips and return as a result just the online :

#!/bin/bash



is_alive_ping()

{

  ping -c 1 $1 > /dev/null

  [ $? -eq 0 ] && echo Node with IP: $i is Online.

}



for i in 10.1.1.{1..255} 

do

is_alive_ping $i & disown

done

Note change 10.1.1. to you subnet , a 1..255 tell the script to start from 10.1.1.1 and loop tell 10.1.1.255

Execute:

./ping_scan.sh