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$TTL    604800
@       IN      SOA     ns1.example.com. admin.example.com. (
                              2         ; Serial
                         604800         ; Refresh
                          86400         ; Retry
                        2419200         ; Expire
                         604800 )       ; Negative Cache TTL
;

@       IN      NS      ns1.example.com.
2       IN      PTR     ns1.example.com.
3       IN      PTR     www.example.com.