Check Sender Score from IP using command line. bash script

senderscore.sh

#!/usr/bin/env bash                                                                                      │ject-with tcp-reset
# usage: ./senderscore.sh 74.91.28.11

if [ -z "$1" ]
    then
    echo "IP is missing as arguemnt."
    exit
fi

IP=$1
REVERSED=`echo $IP | awk -F . '{print $4"."$3"."$2"."$1".score.senderscore.com"}'`
LOOKUP=`dig a $REVERSED +short`
echo `echo $LOOKUP | awk -F . '{print $4""}'`