#!/bin/bash


address_prefix='192.168.5.'

for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50; do
{
    ping -c2 -w2 ${address_prefix}$i &> /dev/null && echo -e "${address_prefix}$i\tonline"
} &

done

wait


# nmap -sP 192.168.5.*