Dns Reverso rede com mascara 192

Senhores (as)

Estou apanhando para configurar a zona reversa do DNS de uma rede com mascara 192 segue os meus arquivos
de configuração. O arquivo db.127.0.0 está criado mais ele não é relevante para o problema. O named sobe sem logar nenhum problema
as consultas de nome funcionam corretamente porem quando vou consultar recursivamente ele dá timeout

Note: nslookup is deprecated and may be removed from future releases.
Consider using the `dig´ or `host´ programs instead. Run nslookup with
the `-sil[ent]´ option to prevent this message from appearing.
> proxy.mydomain.com.br
Server: 10.221.21.23
Address: 10.221.21.23#53

Name: proxy.mydomain.com.br
Address: 172.16.200.1


Note: nslookup is deprecated and may be removed from future releases.
Consider using the `dig´ or `host´ programs instead. Run nslookup with
the `-sil[ent]´ option to prevent this message from appearing.
> 172.16.200.1
;; connection timed out; no servers could be reached



/etc/named.conf
---------------

options {
directory "/var/named";
};

zone "mydomain.com.br" in {
type master;
file "db.mydomain.com.br";
};

zone "." in {
type hint;
file "named.root";

};

zone "0-63.200.16.172.in-addr.arpa"{
type master;
file "200.16.172.db";
};


zone "0.0.127.in-addr.arpa" in {
type master;
file "db.127.0.0";
};


/var/named/db.mydomain.com.br
-----------------------------
TTL 3h
@ IN SOA proxy.mydomain.com.br. root.mydomain.com.br. (
26030301 ; Serial
3h ; Refresh after 3 hours
1h ; Retry after 1 hours
1w ; Expire after 1 week
1h ) ; Negative caching TTL of 1 day
-------------
; Name Servers
;-------------
@ IN NS proxy.mydomain.com.br.
@ IN NS mail.mydomain.com.br.
;--------------
;Host Addresses
;--------------
proxy.mydomain.com.br. IN A 172.16.200.1
mail.mydomain.com.br. IN A 172.16.200.2



/var/named/db.200.16.172.db
$TTL 3h
@ IN SOA proxy.mydomain.br. root.mydomain.com.br. (
2000062803 ; serial
3H ; refresh
1H ; retry
1W ; expire
1D ; default_ttl
)
IN NS proxy.mydomain.com.br.

;---------------------------------
; .:Zona Reversa:.
;---------------------------------

1.0-63.200.16.172 IN PTR proxy.mydomain.com.br.
2.0-63.200.16.172 IN PTR mail.mydomain.com.br.

[thiagog]

e so alterar aqui:

zone "172.16.200.in-addr.arpa"{
type master;
file "200.16.172.db";
};

zone e o inverso do IP sem o ULTIMO OCTETO.