$TTL 3600
@ IN SOA dns {{ item.administrator }}. (
  {{ '%Y%m%d%H' | strftime }} ;Serial
  3600 ;Refresh
  1800 ;Retry
  3600000 ;Expire
  172800 ;Minimum
)

{{ item.name }}.    IN NS dns
{{ item.name }}.    IN NS slave
{{ item.name }}.    IN A {{ item.ipv4 }}
{{ item.name }}.    IN AAAA {{ item.ipv6 }}

dns         IN A {{ item.ipv4 }}
dns         IN AAAA {{ item.ipv6 }}
slave       IN A {{ item.slave }}

{% for alias in item.aliases %}
{{ alias }} IN CNAME @
{% endfor %}