cat /etc/bind/dynamic/10.rev
$TTL 3600
1.10.10.IN-ADDR.ARPA    IN SOA  ns.certexnet.com. root.ns.certexnet.com. (
                                2007052701 ; serial
                                3600       ; refresh (1 hour)
                                900        ; retry (15 minutes)
                                3600000    ; expire (5 weeks 6 days 16 hours)
                                3600       ; minimum (1 hour)
                                )
                        NS      ns.certexnet.com.

$ORIGIN 1.10.10.IN-ADDR.ARPA.

1                       PTR     surkit.certexnet.local.
5                       PTR     xentol.certexnet.local.
6                       PTR     macdaver.certexnet.local.
7                       PTR     thinkbox.certexnet.local.