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Date:      Thu, 24 Oct 1996 15:02:32 -0500
From:      Hal Snyder <>
Cc:        "Ben Black <> John Brann" <>
Subject:   Re: DNS, reverse subnets
Message-ID:  <>
References:  <> <>

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Ben Black wrote:
> >I am having trouble with the reverse resolution (i.e. converting my
> >IP address back into the hostname).  All the examples I have are based on
> >converting whole networks, is there something different about the '.rev'
> >file when only resolving one address?
> >
> you can't do it.  DNS currently has no support for classless addressing so
> blocks smaller than a class C cannot be delegated.  your provider will have
> to handle the reverse DNS for you.

I think this is in BIND (aka named) 4.9.4, supporting RFC 1101.
Vixie spoke on this at the October LISA - I don't see detailed
after a quick net search, but the tutorial included something like:
[with apologies to the *real*]

net	ptr
net2	ptr

0	ptr
	a	; /27
64	ptr
	a ; /29

I haven't had a chance to try it myself yet.

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