@     IN SOA   zotac0.zotac. hostmaster (
                        307       ; serial
                        1H        ; refresh
                        4H        ; retry
                        3W        ; expire
                        1D )      ; minimum
                NS      zotac0.zotac.
0.20.10.in-addr.arpa.  IN      NS      zotac0.zotac.

1       PTR     zotac0.zotac.
101     PTR     zotac1.zotac.
102     PTR     zotac2.zotac.
103     PTR     zotac3.zotac.
104     PTR     zotac4.zotac.