#!/usr/local/bin/bash
byte=`echo {"",1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}`
for num in `echo {1,2}{0,1,2,3,4,5,6,7,8,9}{0,1,2,3,4,5,6,7,8,9}`; do
  [ $num -lt 255 ] && byte="$byte $num"
done
echo "$byte"
for b1 in 193 194 195; do
  for b2 in $byte; do
    for b3 in $byte; do
      for b4 in $byte; do
        echo -n "$b1.$b2.$b3.$b4 " >> ip_data
        host -t PTR $b4.$b3.$b2.$b1.in-addr.arpa >> ip_data 2>&1
      done
    done
  done
done