$TTL 30M
@   IN  SOA     localhost. admin.sdsys.ru. (
        1           ; serial
        30M         ; refresh master->slave
        2M          ; retry on master not responding
        2W          ; expire to be authoritative
        15M         ; minimum TTL
)
; Specify our two nameservers
@		IN	NS		localhost.

; Define hostname -> IP pairs which you wish to resolve