IP='130.10.10.10'SUBNET is 130.10.8.0
NETMASK='255.255.252.0'
l="${IP%.*}";r="${IP#*.}";n="${NETMASK%.*}";m="${NETMASK#*.}"
SUBNET=$((${IP%%.*}&${NETMASK%%.*})).\
$((${r%%.*}&${m%%.*})).\
$((${l##*.}&${n##*.})).\
$((${IP##*.}&${NETMASK##*.}))
l="${SUBNET%.*}";r="${SUBNET#*.}"
BROADCAST=$((${SUBNET%%.*}|256+~${NETMASK%%.*})).\
$((${r%%.*}|256+~${m%%.*})).\
$((${l##*.}|256+~${n##*.})).\
$((${SUBNET##*.}|256+~${NETMASK##*.}))
BROADCAST is 130.10.11.255
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