#!/bin/bash

subnet="10.10.21"
result_pingable=""
result_unpingable=""

for ((i=1; i<=254; i++))
do
    ip="${subnet}.${i}"
    if ping -c 1 -W 1 "${ip}" >/dev/null 2>&1; then
        result_pingable+="Pingable: ${ip}\n"
    else
        result_unpingable+="Unpingable: ${ip}\n"
    fi
done

echo -e "Pingable Hosts:\n$result_pingable"
echo -e "Unpingable Hosts:\n$result_unpingable"