$TTL 86400
@     IN     SOA    dns1.zone1.com.     hostmaster.zone1.com. (
                    2001062501 ; serial
                    21600      ; refresh after 6 hours
                    3600       ; retry after 1 hour
                    604800     ; expire after 1 week
                    86400 )    ; minimum TTL of 1 day

      IN     NS     dns1.zone1.com.

             IN     A       10.53.0.1

dns1         IN     A       10.53.0.1