Just use DNSSEC, the RRSIG records tell you the apex of the zone :-)

        Olafur


On 23/11/2012 06:42, Jim Reid wrote:
On 23 Nov 2012, at 11:17, Tony Finch <[email protected]> wrote:

Just query for the SOA at the full RDNS name, and the name server will
return the zone apex name and SOA record in the authority section of its
reply (or possibly in the answer section though that's unlikely).

http://tools.ietf.org/html/draft-andrews-dnsext-soa-discovery

We have been here before.

The ENUM name space has comparable properties to ip6.arpa: lots of labels, 
"irregular" delegation points and sparse population. Some ENUM applications and 
use cases had a need to find the closest encloser too. So a long time ago, I helped write 
up something similar for the ENUM WG -- 
http://tools.ietf.org/html/draft-ietf-enum-void-02 -- and was told I was a naughty boy. 
It was apparently a Very Bad Thing to treat data from the Authority Section as an answer 
from the DNS: resolving servers could do this, but nothing else apparently. I suspect 
Mark's draft may have been killed because of that too.

FWIW there were other religious issues which meant that ENUM draft ended up 
going nowhere.

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