domain name system - Global Reverse DNS look-ups not working

I am moving from an old server to a new one and everything went well until I got to the DNS server. I cannot get the reverse look-up to work.

I cannot find any misconfiguration but I'm not an expert. rDNS locally works but from other Inet hosts it fails.

named.conf:

zone "5.253.159.in-addr.arpa" IN {

   type master;
   file "5.253.159.in-addr.arpa";
   allow-query { any; };

};

Zone config: (5.253.159.in-addr.arpa)

$TTL 86400

@ IN SOA h4u.be. root.h4u.be. (

  2012083001  ;Serial
   3600        ;Refresh
   1800        ;Retry
   604800      ;Expire
   86400       ;Minimum TTL

)

5.253.159.in-addr.arpa. IN NS ns.h4u.be.
5.253.159.in-addr.arpa. IN NS ns2.h4u.be.

123 IN PTR h4u.be.

Localhost dig result:

;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 65102
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 2

;; QUESTION SECTION:
;123.5.253.159.in-addr.arpa. IN PTR

;; ANSWER SECTION:
123.5.253.159.in-addr.arpa. 86400 IN PTR h4u.be.

;; AUTHORITY SECTION:
5.253.159.in-addr.arpa. 86400 IN NS ns2.h4u.be.
5.253.159.in-addr.arpa. 86400 IN NS ns.h4u.be.

;; ADDITIONAL SECTION:
ns.h4u.be. 86400 IN A 159.253.5.123
ns2.h4u.be. 86400 IN A 159.253.5.123

;; Query time: 3 msec
;; SERVER: 159.253.5.123#53(159.253.5.123)
;; WHEN: Thu Aug 30 13:11:58 2012
;; MSG SIZE rcvd: 131

Inet dig result:

;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 43907
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;123.5.253.159.in-addr.arpa. IN PTR

;; AUTHORITY SECTION:
5.253.159.in-addr.arpa. 8032 IN SOA ns3.uxw.nl. ns3.uxw.nl. 0 10800 3600 >604800 3600

;; Query time: 0 msec
;; SERVER: 62.193.206.133#53(62.193.206.133)
;; WHEN: Thu Aug 30 13:12:32 2012
;; MSG SIZE rcvd: 90