netbox-community-netbox/netbox/templates/inc/custom_fields_panel.html

{% with custom_fields=object.get_custom_fields %}
    {% if custom_fields %}
        <div class="card">
            <h5 class="card-header">
                Custom Fields
            </h5>
            <div class="card-body">
                <table class="table table-hover attr-table">
                    {% for field, value in custom_fields.items %}
                        <tr>
                            <td><span title="{{ field.description }}">{{ field }}</span></td>
                            <td>
                                {% if field.type == 'boolean' and value == True %}
                                    <i class="mdi mdi-check-bold text-success" title="True"></i>
                                {% elif field.type == 'boolean' and value == False %}
                                    <i class="mdi mdi-close-thick text-danger" title="False"></i>
                                {% elif field.type == 'url' and value %}
                                    <a href="{{ value }}">{{ value|truncatechars:70 }}</a>
                                {% elif field.type == 'multiselect' and value %}
                                    {{ value|join:", " }}
                                {% elif value is not None %}
                                    {{ value }}
                                {% elif field.required %}
                                    <span class="text-warning">Not defined</span>
                                {% else %}
                                    <span class="text-muted">&mdash;</span>
                                {% endif %}
                            </td>
                        </tr>
                    {% endfor %}
                </table>
            </div>
        </div>
    {% endif %}
{% endwith %}