#!/bin/bash
counter0=0

while [ $counter0 -lt 256 ]; do
    counter1=0
    while [ $counter1 -lt 256 ]; do
	counter2=0
	while [ $counter2 -lt 256 ]; do
	    counter3=0
	    while [ $counter3 -lt 256 ]; do
		echo -n $counter0.$counter1.$counter2.$counter3 :
		ping $counter0.$counter1.$counter2.$counter3 -c 1 | grep "bytes of data"
		counter3=$((($counter3+1)))
	    done
	    counter2=$((($counter2+1)))
	done
	counter1=$((($counter1+1)))
    done
    counter0=$((($counter0+1)))
done