From: "t3ch.dude" <t3ch.dude@...>
Date: 2008-12-04T07:09:23+09:00
Subject: Re: ipaddr and invalid ipv4 addresses

On Dec 3, 7:03 am, Martin DeMello <martindeme...@gmail.com> wrote:
> What's going on here?
>
> irb(main):002:0> require 'ipaddr'
> => true
>
> irb(main):003:0> ip = IPAddr.new('192.168.1.1024')
> => #<IPAddr: IPv4:192.168.5.0/255.255.255.255>

The snippet above is pretty easy to understand if you convert the ip
to a single integer, then convert back to hex...

irb(main):003:0> ip1=((192*256+168)*256+1)*256+1024
=> 3232236800
irb(main):004:0> ip1.to_s(16).scan(/../).map{|v| v.to_i(16)}.join
( ".")
=> "192.168.5.0"