#!/bin/bash

fl="$1"

if [[ "${fl}X" == "X" ]]
 then
    echo "Usage: $0 <filename>"
    exit
 fi

if [[ ! -f ${fl} ]]
 then
    echo "Usage: $0 <filename>"
    exit
 fi

filetype=$(file ${fl} | grep ASCII)
if [[ "X" != "${filetype}X" ]]
 then 
    CMD='cat'
 else
    filetype=$(file ${fl} | grep 'gzip compressed data')
    if [[ "X" != "${filetype}X" ]]
     then 
        CMD='zcat'
     else
        echo "Usage: $0 <filename>"
        exit
     fi
        
 fi

${CMD} $1 | grep IP= | awk '{print $10}' | awk -F':' '{print $1}' | sort -u | sed 's/IP=//' | while read line
 do
    name=$(dig -x ${line} +short)
    echo "${line} ${name}"
 done