> Okay, try this:
> HOSTALIAS REGEXP:172\.26\.(\d{1,3})\.(\d{1,3})$ $1.net
> 
> This will give you an Organization Report that contains a list
> <3rdOctet>.net "organizations",
> 
> eg if you have 22 hits from 172.26.147.12, and 36 hits from  172.26.147.108,
> then 147.net will be listed with 58 requests.
> 
> If you need to identify indivdual hosts as well, use $2.$1.net instead.
> 
> You have to use a known TLD as the suffix, unless you want to update Analogs
> .dom files

Great!  Thanks.  I didn't know you could do regex in a HOSTALIAS.
Here's what I ended up doing:

HOSTALIAS REGEXP:(\d+)\.(\d+)\.(\d+) $3.$2.$1.arpa
DOMCHARTEXPAND "arpa,172.arpa,25.172.arpa,26.172.arpa"
SUBDOMAIN *.*.*.*

It ends up with results like:

reqs    %bytes  domain
189500  100%    .arpa (Arpanet)
189190  99.75%    172.arpa
126165  70.53%      26.172.arpa
18343   9.83%         14.26.172.arpa
13063   6.49%         12.26.172.arpa
9660    5.16%         9.26.172.arpa
62632   29.10%      25.172.arpa
9049    3.71%         4.25.172.arpa
7000    4.08%         13.25.172.arpa
5343    3.93%         7.25.172.arpa
166     0.04%     192.arpa
166     0.04%       168.192.arpa
98      0.02%         202.168.192.arpa
61      0.02%         203.168.192.arpa
7                     226.168.192.arpa

...which isn't perfect, but is probably close enough.  Thanks for your help.
Now, is there a way to make it chart more than just the top 10 domains?
I didn't see anything under the chart commands quick reference.

-- 
Ben "Obi-Wan" Hollingsworth                             [EMAIL PROTECTED]
   The stuff of earth competes for the allegiance I owe only to the
     Giver of all good things, so if I stand, let me stand on the
       promise that You will pull me through.  -- Rich Mullins
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