From LILUG
$TTL 3D
@ IN SOA master.cluster. hostmaster.cluster. (
1 ; Serial
8H ; Refresh
2H ; Retry
4W ; Expire
1D) ; min TTL
NS ns.cluster.
1 PTR master.cluster.
10 PTR host-0A.cluster.
11 PTR host-0B.cluster.
12 PTR host-0C.cluster.
13 PTR host-0D.cluster.
14 PTR host-0E.cluster.
15 PTR host-0F.cluster.
16 PTR host-10.cluster.
17 PTR host-11.cluster.
18 PTR host-12.cluster.
19 PTR host-13.cluster.
20 PTR host-14.cluster.
21 PTR host-15.cluster.
22 PTR host-16.cluster.
23 PTR host-17.cluster.
24 PTR host-18.cluster.
25 PTR host-19.cluster.
26 PTR host-1A.cluster.
27 PTR host-1B.cluster.
28 PTR host-1C.cluster.
29 PTR host-1D.cluster.
30 PTR host-1E.cluster.
31 PTR host-1F.cluster.
