IP Address Converter

Question

There is IP address: 66.102.13.19, and from this address as that received this address

http://1113984275

But how? And how I can make this

Answer 1

Here's my take:

$ host google.com
google.com has address 216.58.216.142
$ ./ip2d.sh 216.58.216.142
3627735182
$ ./d2ip.sh 3627735182
216.58.216.142

ip2d.sh:

#!/bin/bash

IFS=.
set -- $*
echo $(( ($1*256**3) + ($2*256**2) + ($3*256) + ($4) ))

d2ip.sh:

#!/bin/bash

IFS=" " read -r a b c d  <<< $(echo  "obase=256 ; $1" |bc)
echo ${a#0}.${b#0}.${c#0}.${d#0}