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From: Erik Gustafson <erik@alaknoleion.nu>
To: DanB <longterm@chatusa.com>, freebsd <questions@freebsd.org>
Date: Tue, 8 Jul 2003 11:39:04 +0200
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Subject: Re: netmask 0xfffffff8 broadcast 205.238.xx.7
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On Tuesday 08 July 2003 04.55, DanB wrote:
> inet 205.238.xx.1 netmask 0xfffffff8 broadcast 205.238.xx.7.   Need a
> netmask convertor   to change 0xfffffffc to 255.255.xxx.xxx. Anybody
> know of a good one?
>

There are a few handy tools in the ports. 

A few examples:
Port:   ipcalc-0.35_1
Path:   /usr/ports/net/ipcalc
Info:   IP Calculator

Port:   whatmask-1.1
Path:   /usr/ports/net/whatmask
Info:   Easily convert between three common subnet mask notations

Port:   netmask-2.3.3_1
Path:   /usr/ports/net/netmask
Info:   Tool for generating terse netmasks in several common formats