request

$request_stack = \Drupal::service('request_stack');
$request = $request_stack->getCurrentRequest();
$ip_address = $request->getClientIp();

/**
 * The request stack.
 *
 * @var \Symfony\Component\HttpFoundation\RequestStack
 */
protected $requestStack;

/**
 * Constructs a new MyController.
 *
 * @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
 *   The request stack.
 */
public function