42.10.in-addr.arpa. 600 IN SOA space.labitat.dk. esmil.labitat.dk. 2019040101 7200 3600 604800 86400
42.10.in-addr.arpa. 600 IN NS  space.labitat.dk.

{% for host in local_hosts %}
{% if 'ipv4' in host %}
{% for ip in host.ipv4 %}
{% if ip.startswith('10.42.') %}
{{ ip.split('.')[3] }}.{{ ip.split('.')[2] }}.42.10.in-addr.arpa. 600 IN PTR {{ host.name }}.s.
{% endif %}
{% endfor %}
{% endif %}
{% endfor %}