From owner-freebsd-questions  Wed Mar  5 10:29:01 1997
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Date: Wed, 5 Mar 1997 10:09:40 -0800 (PST)
From: Dan Busarow <dan@dpcsys.com>
To: William Wong <wwong@wiley.csusb.edu>
cc: questions@freebsd.org
Subject: Re: results by gethostby*.gethostanswer
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On Wed, 5 Mar 1997, William Wong wrote:
> Has anybody seen something like this before?
> 
>   http: gethostby*.gethostanswer: asked for "102.63.32.128.in-addr.arpa", got
>   "102.0.63.32.128.in-addr.arpa"

It's reverse DNS on a subnet, a /25 based on the target address.

See draft-ietf-cidrd-classless-inaddr-01.txt

Dan
-- 
 Dan Busarow                                                  714 443 4172
 DPC Systems / Beach.Net                                    dan@dpcsys.com
 Dana Point, California  83 09 EF 59 E0 11 89 B4   8D 09 DB FD E1 DD 0C 82