Great scripts and tips!!

Angelbar

Reynosa, Mexico

# Get subnets from arguments
NETS=$@

# Handle lack of arguments
if [ "x$NETS" = "x" ]; then
echo “Usage example: sh nsscan.sh 192.168.1″
echo “This would scan 192.168.1.0/24″
echo “Accepts class C subnets only”
exit 2
fi

IPRange=”1 254″
for NET in $NETS; do
for n in $(seq $IPRange); do
ADDR=${NET}.${n}
# Only print line if nslookup returns a result
if [ "x$(nslookup ${ADDR} | awk -F '=' '{ print $2 }'| sed 's/^[ t]*//’ | sed ‘/^$/d’ | sed ‘s/.$//’)” != “x” ]; then
echo “${ADDR} `nslookup ${ADDR} | awk -F “=” ‘{ print $2 }’|sed ‘s/^[ t]*//’ | sed ‘/^$/d’ | sed ‘s/.$//’`”
fi
done
done