Slap together minimal views integration.

src/EmbargoIpRangeViewsData.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace Drupal\embargo;
+
+use Drupal\views\EntityViewsData;
+
+/**
+ * Embargo IP range entity views data generation.
+ */
+class EmbargoIpRangeViewsData extends EntityViewsData {
+
+}

src/EmbargoViewsData.php

@@ -0,0 +1,12 @@
+<?php
+
+namespace Drupal\embargo;
+
+use Drupal\views\EntityViewsData;
+
+/**
+ * Embargo entity views data generation.
+ */
+class EmbargoViewsData extends EntityViewsData {
+
+}

src/Entity/Embargo.php

@@ -32,6 +32,7 @@
  *   handlers = {
  *     "storage" = "Drupal\embargo\EmbargoStorage",
  *     "view_builder" = "Drupal\Core\Entity\EntityViewBuilder",
+ *     "views_data" = "Drupal\embargo\EmbargoViewsData",
  *     "list_builder" = "Drupal\embargo\EmbargoListBuilder",
  *     "form" = {
  *       "add" = "Drupal\embargo\Form\EmbargoForm",

src/Entity/IpRange.php

@@ -29,6 +29,7 @@
  *   handlers = {
  *     "storage" = "Drupal\embargo\IpRangeStorage",
  *     "view_builder" = "Drupal\Core\Entity\EntityViewBuilder",
+ *     "views_data" = "Drupal\embargo\EmbargoIpRangeViewsData",
  *     "list_builder" = "Drupal\embargo\EmbargoListBuilder",
  *     "form" = {
  *       "add" = "Drupal\embargo\Form\IpRangeForm",