while IFS=: read -r ip ports; do
   savIFS=$IFS
   IFS=,; set -f; set -- $ports
      for port
      do
         nc "$ip" "$port" 1>/dev/null 2>&1
         case $? in
            0 ) status="PASS" ;;
            * ) status="FAIL" ;;
         esac
         echo "$ip:$port - $status"
      done
   IFS=$savIFS
done < ips.csv