==== db.172 =====

;
; BIND reverse data file for local loopback interface
;
$TTL    604800
@       IN      SOA     ns.stupidtre.es. trunk.stupidtre.es. (
                              3         ; Serial
                         604800         ; Refresh
                          86400         ; Retry
                        2419200         ; Expire
                         604800 )       ; Negative Cache TTL

8.16.172.in-addr.arpa.  IN      NS      ns.stupidtre.es.
;@      IN      NS      ns.stupidtre.es.

152     IN      PTR     www.stupidtre.es.
153     IN      PTR     mta.stupidtre.es.

==== named.conf.local =====
        zone "stupidtre.es" {
                type master;
                file "/etc/bind/db.stupidtre.es";
        };

        zone "8.16.172.in-addr.arpa" IN {
                type master;
                notify no;
                file "/etc/bind/db.172";
        };


$ sudo named-checkzone 8.16.172.in-addr.arpa. db.172
zone 8.16.172.in-addr.arpa/IN: loaded serial 3
OK


McFu:~ linkxs$ host stupidtre.es
stupidtre.es has address 75.80.186.73
stupidtre.es mail is handled by 10 eforward2.registrar-servers.com.
stupidtre.es mail is handled by 15 eforward4.registrar-servers.com.
stupidtre.es mail is handled by 10 eforward1.registrar-servers.com.
stupidtre.es mail is handled by 20 eforward5.registrar-servers.com.
stupidtre.es mail is handled by 10 eforward3.registrar-servers.com.
McFu:~ linkxs$ host 75.80.186.73
73.186.80.75.in-addr.arpa domain name pointer cpe-75-80-186-73.san.res.rr.com.
McFu:~ linkxs$ nslookup 75.80.186.73
Server:		8.8.8.8
Address:	8.8.8.8#53

Non-authoritative answer:
73.186.80.75.in-addr.arpa	name = cpe-75-80-186-73.san.res.rr.com.

Authoritative answers can be found from:

McFu:~ linkxs$

McFu:~ linkxs$ nslookup @stupidtre.es
Server:		8.8.8.8
Address:	8.8.8.8#53

** server can't find @stupidtre.es: NXDOMAIN

McFu:~ linkxs$ nslookup @ns.stupidtre.es
Server:		8.8.8.8
Address:	8.8.8.8#53

Non-authoritative answer:
Name:	\@ns.stupidtre.es
Address: 75.80.186.73