--- - name: "fail if {{ inventory_hostname }} does not have any {{ ip_version }} address on {{ monitor_address_block }}" fail: msg: "{{ inventory_hostname }} does not have any {{ ip_version }} address on {{ monitor_address_block }}" when: - hostvars[inventory_hostname]['ansible_all_' + ip_version + '_addresses'] | ipaddr(hostvars[inventory_hostname]['monitor_address_block']) | length == 0