DJBDNS DNS reverse delegation of a /29 with SBC/AT&T

[mark david mcCreary <mdm@one-man-isp.com>]

I've got a new DSL line with a small static IP address block - 
70.255.5.232/29

I have asked AT&T to reverse delegate that to my DNS servers
so that I can correctly resolve the PTR records, and they
did.  They say they are using the Classless Reverse
Delegation –RFC 2317 (Section 5.2).

So my first question is what have they called my zone.  I
dig around a little bit, hitting the SBC name server at
151.164.1.1, and ask it what it knows about the first
address in my little subnet.

;; QUESTION SECTION:
;232.5.255.70.in-addr.arpa.	IN	ANY

;; ANSWER SECTION:
232.5.255.70.in-addr.arpa. 7200	IN	NS	ns.internet-tools.com.
232.5.255.70.in-addr.arpa. 7200	IN	NS	ns2.internet-tools.com.
232.5.255.70.in-addr.arpa. 7200	IN	NS	ns3.internet-tools.com.


I interpret this to mean that 232.5.255.70.in-addr.arpa is
the answer, although I don't think this is correct.  I've
seen some documentation and examples that sometimes the
zones are called 232-238.5.255.70.in-addr.arpa, or
232\29.5.255.70.in-addr.arpa.  It's up to the delegating DNS
what to name it.

So I set up these records in TinyDNS.

.232.5.255.70.in-addr.arpa::ns.internet-tools.com
.232.5.255.70.in-addr.arpa::ns2.internet-tools.com
.232.5.255.70.in-addr.arpa::ns3.internet-tools.com
^234.232.5.255.70.in-addr.arpa:mercury.mail-list.com
^236.232.5.255.70.in-addr.arpa:queue.internet-tools.com
^237.232.5.255.70.in-addr.arpa:ns4.internet-tools.com


However when I query via dig to my servers, I don't get any
valid answers back.

I'm thinking that even if I don't have the right zone as
AT&T called it, my server should still work when queried
directly.

For example

dig://234.5.255.70.in-addr.arpa;querytype=PTR;server=68.92.51.254

; <<>> DiG 9.2.2 <<>> @68.92.51.254 234.5.255.70.in-addr.arpa PTR
;; global options:  printcmd
;; connection timed out; no servers could be reached




I have at least two questions.

1)  Is AT&T calling my little zone 232.5.255.70.in-addr.arpa ?

2)  What do I need to do in TinyDNS (DJBDNS) to make this work ?


Does anybody have some clues or suggestions for me ?

THanks

mark