Reverse DNS delegation problem

[Chittaranjan Mandal]

Could I request some help regarding the above. The following (small)
files are attached: named.conf  rev-cc.iitkgp  rev-iitkgp .
The query for 10.14.18.50 fails.
[root at localac root]# host 10.14.18.50
Host 50.18.14.10.in-addr.arpa not found: 3(NXDOMAIN)

I get back an authority for 10.14.18.50.
[root at localac root]# dig -x 10.14.18.50  +norecurse
;; flags: qr ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 1
;; AUTHORITY SECTION:
14.10.in-addr.arpa.     259200  IN      NS      sit-dns.sit.iitkgp.

However, I get not results when I leave out the "+norecurse"
[root at localac root]# dig -x 10.14.18.50
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

But, "sit-dns.sit.iitkgp." gives me the answer alright.
[root at localac root]# dig @sit-dns.sit.iitkgp. -x 10.14.18.50
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 1, ADDITIONAL: 1
;; ANSWER SECTION:
50.18.14.10.in-addr.arpa. 259200 IN     PTR     chitta.sit.iitkgp.

What is going wrong? How to get it working?

Chitta

-- Binary/unsupported file stripped by Ecartis --
-- Type: text/x-c++src
-- File: named.conf


-- Attached file included as plaintext by Ecartis --
-- File: rev-cc.iitkgp

$TTL 259200	; 3 days
100.3.10.in-addr.arpa.	IN SOA	localac.cc.iitkgp. root.cc.iitkgp. (
				2004062784 ; serial
				28800      ; refresh (8 hours)
				7200       ; retry (2 hours)
				2419200    ; expire (4 weeks)
				86400      ; minimum (1 day)
				)
			NS	localac.cc.iitkgp.

$ORIGIN 100.3.10.in-addr.arpa.
92	PTR	localac.cc.iitkgp.
150	PTR	acfileserver1.cc.iitkgp.
87	PTR	acfileserver2.cc.iitkgp.

-- Attached file included as plaintext by Ecartis --
-- File: rev-iitkgp

$TTL 259200	; 3 days
@			IN	SOA	localac.cc.iitkgp. root.cc.iitkgp. (
				2004062720 ; serial
				28800      ; refresh (8 hours)
				7200       ; retry (2 hours)
				2419200    ; expire (4 weeks)
				86400      ; minimum (1 day)
				)
			IN	NS	localac.cc.iitkgp.

100.3.10.in-addr.arpa.	IN	NS	localac.cc.iitkgp.
14.10.in-addr.arpa.	IN	NS	sit-dns.sit.iitkgp.

localac.cc.iitkgp.	IN	A	10.3.100.92
sit-dns.sit.iitkgp.	IN	A	10.14.0.2