Calcular faixas de endereçamento IP... [RESOLVIDO]

Veja se esse ajuda? tá meio "tosquinho" mas... =)

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#!/bin/bash
#
# Uso: ./script <ip> <mascara>
#
ip="$1"
mascara="$2"

OLD_IFS=$IFS
IFS="."

set - $ip
nip_1=$1
nip_2=$2
nip_3=$3
nip_4=$4

set - $mascara
nm_1=$1
nm_2=$2
nm_3=$3
nm_4=$4

network="$((nip_1 & nm_1)).$((nip_2 & nm_2)).$((nip_3 & nm_3)).$((nip_4 & nm_4))"
broadcast="$((nip_1 | (255 ^ nm_1))).$((nip_2 | (255 ^ nm_2))).$((nip_3 | (255 ^ nm_3))).$((nip_4 | (255 ^ nm_4)))"

set - $network
inicio=$(($4 + 1))
a=$1
b=$2
c=$3

set - $broadcast
fim=$(($4 - 1))

IFS=$OLD_IFS

echo -e "Network Address: ${network}\nBroadcast: $broadcast"
echo "IP's disponiveis:"

for i in `seq $inicio $fim`
do
echo "$a.$b.$c.$i"
done
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