$TTL    86400
@       IN      SOA     rebind. admin.rebind. (
                              1         ; Serial
                         604800         ; Refresh
                          86400         ; Retry
                        2419200         ; Expire
                          86400 )       ; Negative Cache TTL

@           IN    NS    ns

ns          IN    A     10.53.0.5

subdomain   IN    A     10.53.0.1