netbox-community-netbox/netbox/templates/ipam/inc/toggle_available.html

{% load helpers %}

{% if show_assigned or show_available is not None %}
  <div class="btn-group" role="group">
    <a href="{{ request.path }}{% querystring request show_assigned='true' show_available='false' %}" class="btn btn-sm {% if show_assigned and not show_available %}btn-secondary active{% else %}btn-outline-secondary{% endif %}">
      Show Assigned
    </a>
    <a href="{{ request.path }}{% querystring request show_assigned='false' show_available='true' %}" class="btn btn-sm {% if show_available and not show_assigned %}btn-secondary active{% else %}btn-outline-secondary{% endif %}">
      Show Available
    </a>
    <a href="{{ request.path }}{% querystring request show_assigned='true' show_available='true' %}" class="btn btn-sm {% if show_available and show_assigned %}btn-secondary active{% else %}btn-outline-secondary{% endif %}">
      Show All
    </a>
  </div>
{% endif %}