*** Can't find server name for address 219.101.200.11: No information

Hi I'm running bind 9.2.3 on Solaris 2.5.1.
having a really strange problem on my authoritive dns server.
When running nslookup from any host pointing to this server I get "No
information".
The problem started when I rebooted the server today.

At the bottom of this post is the result of a dig command, as you can
see the answer section returns a CNAME instead of a PTR.

I have been over and over my reverse dns settings and cannot find a
problem.
My named.conf file has this entry:

zone "net0.200.101.219.in-addr.arpa" {
type master;
file "named.rev.219.101.200.net0";
};

And inside the named.rev.219.101.200.net0 file it looks like this:
$TTL 3600
@ IN SOA ns1.joho.com. domains.joho.com. (
2006022801 ; serial
3600 ; refresh every 1 hour
3600 ; retry after 1 hour
604800 ; expire after 1 Week
3600 ; default ttl is 1 hour
)
IN NS ns1.joho.com.
IN NS ns2.joho.com.
IN NS ns3.joho.com.

11 IN PTR ns1.joho.com.

Anyone have a clue what could be wrong?
Could this problem be with my ISP who manage the IP block? I have been
allocated a block of 64 IP addresses starting at 219.101.200.0

Regards,
Al

bash-2.05# dig -x 219.101.200.11

; <<>> DiG 8.3 <<>> -x
;; res options: init recurs defnam dnsrch
;; got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 2
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2
;; QUERY SECTION:
;; 11.200.101.219.in-addr.arpa, type = ANY, class = IN

;; ANSWER SECTION:
11.200.101.219.in-addr.arpa. 8m31s IN CNAME
11.net0.200.101.219.in-addr.arpa.

;; AUTHORITY SECTION:
200.101.219.in-addr.arpa. 8m31s IN NS ns1.iprevolution.co.jp.
200.101.219.in-addr.arpa. 8m31s IN NS rns2.softbankbb.jp.

;; ADDITIONAL SECTION:
ns1.iprevolution.co.jp. 14h17m12s IN A 61.115.192.17
rns2.softbankbb.jp. 7m8s IN A 61.115.192.245

;; Total query time: 10 msec
;; FROM: cgp to SERVER: default -- 219.101.200.12
;; WHEN: Wed Mar 1 00:05:40 2006
;; MSG SIZE sent: 45 rcvd: 165

bash-2.05#