Re: IP range to CIDR list VB6 utility?

From: WinGuy (no_spam_at_nomail.bot)
Date: 09/20/04 

Date: Mon, 20 Sep 2004 13:34:04 GMT

Well, Mike, that put a halt to my development! That utility does exactly
what I want and spits out exactly the same listing as what I computed
manually and posted in the very 1st message that I opened this topic with.
There's no need for me to re-invent the wheel, I'll go with the utility that
you pointed out. The only thing more I could want additional would be for
the utility to allow defining of text that goes in front and after each line
in the conversion listing (IPF does not use the same allow/disallow text as
does Apache, but word processor manipulation can correct for that need). The
utility is super cool, free, and works on Windows -- I am happy with it and
can now get down to work! Thank you very much for the link, Mike.

For anyone who wants to continue the project that I started (but have not
finished) and provided listing for in my Sunday 19-Sep-04 10:11AM post in
this topic, please feel free as I hereby donate it as public domain without
restriction. And thanks (a lot!) to all who participated in this topic. :)

"mscir" <mscir@access4less.net> wrote in message
news:10ksv7s6nrml6ed@corp.supernews.com...
> WinGuy,
>
> I know you want to write a VB program to do this, but you might find
> this useful in the mean-time.
>
> http://www.kgsoft.com/products/iprange2cidr/
>
> IPRange2CIDR allows you to convert IP range to CIDR specification. This
> utility is useful for Apache web server administrators and give them a
> possibility to easy manage domain access by using allow and/or deny
> access direcive. Especially if it requires to put a lot of IP addresses.
> Each IP range is converted to the minimal list of CIDR blocks.
>
> Here's the output for the example range you posted:
>
> block 217.224.0.0 - 217.237.161.47
>
> deny from 217.224.0.0/13
> deny from 217.232.0.0/14
> deny from 217.236.0.0/16
> deny from 217.237.0.0/17
> deny from 217.237.128.0/19
> deny from 217.237.160.0/24
> deny from 217.237.161.0/27
> deny from 217.237.161.32/28
>
> Mike

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