$TTL 86400
@       IN  SOA     ns1.test-os.com. ns2.test-os.com. (
        2017011301      ;Serial
        3600    ;Refresh
        1800    ;Retry
        604800  ;Expire
        86400   ;Minimum TTL
)
        IN      NS      ns1.test-os.com.
        IN      NS      ns2.test-os.com.
        IN      MX      10 mail.test-os.com.

@       IN      A       10.220.106.245
ns1     IN      A       10.220.106.245
ns2     IN      A       10.220.106.245
oss     IN      A       10.220.106.250
mail    IN      A       10.220.106.245
www     IN      A       10.220.106.245