Mailing List SIMS@mail.stalker.com Message #14772
From: Joe Laffey <joe@laffeycomputer.com>
Subject: Re: (OT) Interpreting CIDR network info
Date: Wed, 29 Sep 2004 14:26:05 -0500 (CDT)
To: SIMS Discussions <SIMS@mail.stalker.com>
On Wed, 29 Sep 2004, NetHead wrote:

> I realize this is a bit off-topic, but it is relevant in that sometimes
> when trying to set up a blacklist for a range of IP's, my WHOIS reveals
> only a CIDR designation for the network I am suspicious of.
>
> For example, 218.175.0.0/16... how do I interpret that? I have read some
> of the RFC's on CIDR notation, but it still boggles my mind. Would that
> mean that they own the entire range from 218.175.0.0-218.175.254.254?
>
> Is there an easy way to read CIDR? or a tool that will do the conversion?
>
> Thanks for any and all help.

Use the free program Whatmask. (I wrote it.)

http://www.laffeycomputer.com/whatmask.html

There is source doe and binaries for a few platforms, including Macs.


--
Joe Laffey                |        Visual Effects for Film and Video
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