From owner-freebsd-questions  Wed Apr 10 14:30:11 2002
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Date: Wed, 10 Apr 2002 23:48:04 +0300
From: Giorgos Keramidas <keramida@ceid.upatras.gr>
To: Tim McCullagh <tim@halenet.com.au>
Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: Maybe OT Finding the web address associated with some spam
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On 2002-04-10 11:26, Tim McCullagh wrote:
> Hi
>
> I was wondering if anyone can shed any light on how I can find out
> what the actual address to trace to is for the following web address
>
> http://7814731399/webcam_access/index.html

This one doesn't resolve at all.  It's larger than 2^32 (4294967296)
and can't represent a 32-bit Internet address.  Oh wait!  It can, but
after it's stripped of those extra bits.

    $ python
    Python 2.2 (#1, Mar 21 2002, 03:21:57)
    [GCC 2.95.3 20010315 (release)] on freebsd5
    Type "help", "copyright", "credits" or "license" for more information.
    >>> 7814731399 & (2**32-1)
    3519764103L
    >>>

And now, I can use ping(1) to find out the Internet address that
matches 3519764103:

    $ ping -n -c1 3519764103
    PING 3519764103 (209.203.86.135): 56 data bytes
    ...

All this works because Internet addresses are represented as 32-bit
integers.  Any number from [0 .. (2**32-1)] can be used as an Internet
address (well, practically not *any* number, but you get the idea).

Giorgos Keramidas                       FreeBSD Documentation Project
keramida@{freebsd.org,ceid.upatras.gr}  http://www.FreeBSD.org/docproj/

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