Liste de diffusion Message #14772
De: Joe Laffey <>
Sujet: Re: (OT) Interpreting CIDR network info
Date: Wed, 29 Sep 2004 14:26:05 -0500 (CDT)
A: SIMS Discussions <>
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, 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
> 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.)

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

Joe Laffey                |        Visual Effects for Film and Video
LAFFEY Computer Imaging   |        ---------------------------------
St. Louis, MO             |        Show Reel at
USA                       |        ---------------------------------
Mail here will be rejected --> "Sigfried Trap" <>

S'abonner aux messages S'abonner aux sommaires S'abonner aux indexes Se désabonner Ecrire un email au responsable de la liste