ansible-roles/roles/network/templates/hosts.j2

127.0.0.1 localhost
::1       localhost6
{% if net_hosts is not defined or net_hosts | length < 1 %}
{{ ansible_default_ipv4.address }} {{ inventory_hostname }} {{ inventory_hostname | regex_replace('^([^\.]+)\..*','\\1') }}{% if system_hostname is defined %} {{ system_hostname }}{% endif %} 
{% else %}
{% for host in net_hosts %}
{{ host.ip }}  {{ host.aliases | join(' ') }}
{% endfor %}
{% endif %}