diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php
index a56b406..4ad8849 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/EntityReferenceItem.php
@@ -63,9 +63,7 @@ public static function propertyDefinitions(FieldDefinitionInterface $field_defin
       // https://drupal.org/node/2107249
       $target_id_definition = DataDefinition::create('integer')
         ->setLabel(t('Entity ID'))
-        ->setConstraints(array(
-          'Range' => array('min' => 0),
-        ));
+        ->setSetting('unsigned', TRUE);
     }
     else {
       $target_id_definition = DataDefinition::create('string')
diff --git a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/IntegerItem.php b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/IntegerItem.php
index f22e060..760a225 100644
--- a/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/IntegerItem.php
+++ b/core/lib/Drupal/Core/Field/Plugin/Field/FieldType/IntegerItem.php
@@ -26,6 +26,27 @@ class IntegerItem extends NumericItemBase {
   /**
    * {@inheritdoc}
    */
+  public static function defaultSettings() {
+    return array(
+      'unsigned' => FALSE,
+    ) + parent::defaultSettings();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function defaultInstanceSettings() {
+    return array(
+      'min' => '',
+      'max' => '',
+      'prefix' => '',
+      'suffix' => '',
+    ) + parent::defaultInstanceSettings();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public static function propertyDefinitions(FieldDefinitionInterface $field_definition) {
     $properties['value'] = DataDefinition::create('integer')
       ->setLabel(t('Integer value'));
@@ -36,12 +57,40 @@ public static function propertyDefinitions(FieldDefinitionInterface $field_defin
   /**
    * {@inheritdoc}
    */
+  public function getConstraints() {
+    $constraints = parent::getConstraints();
+
+    // If this is an unsigned integer, add a validation constraint for the
+    // integer to be positive.
+    if ($this->getSetting('unsigned')) {
+      $constraint_manager = \Drupal::typedDataManager()->getValidationConstraintManager();
+      $constraints[] = $constraint_manager->create('ComplexData', array(
+        'value' => array(
+          'Range' => array(
+            'min' => 0,
+            'minMessage' => t('%name: The integer must be larger or equal to %min.', array(
+              '%name' => $this->getFieldDefinition()->getLabel(),
+              '%min' => 0,
+            )),
+          ),
+        ),
+      ));
+    }
+
+    return $constraints;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
   public static function schema(FieldDefinitionInterface $field_definition) {
     return array(
       'columns' => array(
         'value' => array(
           'type' => 'int',
           'not null' => FALSE,
+          // Expose the 'unsigned' setting in the field item schema.
+          'unsigned' => $field_definition->getSetting('unsigned'),
         ),
       ),
     );
diff --git a/core/modules/aggregator/lib/Drupal/aggregator/Entity/Feed.php b/core/modules/aggregator/lib/Drupal/aggregator/Entity/Feed.php
index b284823..ff93c30 100644
--- a/core/modules/aggregator/lib/Drupal/aggregator/Entity/Feed.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/Entity/Feed.php
@@ -134,7 +134,8 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
     $fields['fid'] = FieldDefinition::create('integer')
       ->setLabel(t('Feed ID'))
       ->setDescription(t('The ID of the aggregator feed.'))
-      ->setReadOnly(TRUE);
+      ->setReadOnly(TRUE)
+      ->setSetting('unsigned', TRUE);
 
     $fields['uuid'] = FieldDefinition::create('uuid')
       ->setLabel(t('UUID'))
@@ -155,7 +156,8 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
 
     $fields['refresh'] = FieldDefinition::create('integer')
       ->setLabel(t('Refresh'))
-      ->setDescription(t('How often to check for new feed items, in seconds.'));
+      ->setDescription(t('How often to check for new feed items, in seconds.'))
+      ->setSetting('unsigned', TRUE);
 
     $fields['checked'] = FieldDefinition::create('timestamp')
       ->setLabel(t('Checked'))
diff --git a/core/modules/aggregator/lib/Drupal/aggregator/Entity/Item.php b/core/modules/aggregator/lib/Drupal/aggregator/Entity/Item.php
index 19b2bbf..f12ed40 100644
--- a/core/modules/aggregator/lib/Drupal/aggregator/Entity/Item.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/Entity/Item.php
@@ -54,7 +54,8 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
     $fields['iid'] = FieldDefinition::create('integer')
       ->setLabel(t('Aggregator item ID'))
       ->setDescription(t('The ID of the feed item.'))
-      ->setReadOnly(TRUE);
+      ->setReadOnly(TRUE)
+      ->setSetting('unsigned', TRUE);
 
     $fields['fid'] = FieldDefinition::create('entity_reference')
       ->setLabel(t('Aggregator feed ID'))
diff --git a/core/modules/block/custom_block/lib/Drupal/custom_block/Entity/CustomBlock.php b/core/modules/block/custom_block/lib/Drupal/custom_block/Entity/CustomBlock.php
index 68414d3..4ad34d2 100644
--- a/core/modules/block/custom_block/lib/Drupal/custom_block/Entity/CustomBlock.php
+++ b/core/modules/block/custom_block/lib/Drupal/custom_block/Entity/CustomBlock.php
@@ -158,7 +158,8 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
     $fields['id'] = FieldDefinition::create('integer')
       ->setLabel(t('Custom block ID'))
       ->setDescription(t('The custom block ID.'))
-      ->setReadOnly(TRUE);
+      ->setReadOnly(TRUE)
+      ->setSetting('unsigned', TRUE);
 
     $fields['uuid'] = FieldDefinition::create('uuid')
       ->setLabel(t('UUID'))
@@ -168,7 +169,8 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
     $fields['revision_id'] = FieldDefinition::create('integer')
       ->setLabel(t('Revision ID'))
       ->setDescription(t('The revision ID.'))
-      ->setReadOnly(TRUE);
+      ->setReadOnly(TRUE)
+      ->setSetting('unsigned', TRUE);
 
     $fields['langcode'] = FieldDefinition::create('language')
       ->setLabel(t('Language code'))
diff --git a/core/modules/comment/lib/Drupal/comment/Entity/Comment.php b/core/modules/comment/lib/Drupal/comment/Entity/Comment.php
index 69adba8..82a3dab 100644
--- a/core/modules/comment/lib/Drupal/comment/Entity/Comment.php
+++ b/core/modules/comment/lib/Drupal/comment/Entity/Comment.php
@@ -210,7 +210,8 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
     $fields['cid'] = FieldDefinition::create('integer')
       ->setLabel(t('Comment ID'))
       ->setDescription(t('The comment ID.'))
-      ->setReadOnly(TRUE);
+      ->setReadOnly(TRUE)
+      ->setSetting('unsigned', TRUE);
 
     $fields['uuid'] = FieldDefinition::create('uuid')
       ->setLabel(t('UUID'))
diff --git a/core/modules/entity_reference/lib/Drupal/entity_reference/ConfigurableEntityReferenceItem.php b/core/modules/entity_reference/lib/Drupal/entity_reference/ConfigurableEntityReferenceItem.php
index 550f3d7..e681856 100644
--- a/core/modules/entity_reference/lib/Drupal/entity_reference/ConfigurableEntityReferenceItem.php
+++ b/core/modules/entity_reference/lib/Drupal/entity_reference/ConfigurableEntityReferenceItem.php
@@ -110,7 +110,7 @@ public static function propertyDefinitions(FieldDefinitionInterface $field_defin
     if ($target_type_info->hasKey('revision') && $target_type_info->getRevisionTable()) {
       $properties['revision_id'] = DataDefinition::create('integer')
         ->setLabel(t('Revision ID'))
-        ->setConstraints(array('Range' => array('min' => 0)));
+        ->setSetting('unsigned', TRUE);
     }
 
     return $properties;
diff --git a/core/modules/file/lib/Drupal/file/Entity/File.php b/core/modules/file/lib/Drupal/file/Entity/File.php
index 92e1e90..f6d9583 100644
--- a/core/modules/file/lib/Drupal/file/Entity/File.php
+++ b/core/modules/file/lib/Drupal/file/Entity/File.php
@@ -233,7 +233,8 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
     $fields['fid'] = FieldDefinition::create('integer')
       ->setLabel(t('File ID'))
       ->setDescription(t('The file ID.'))
-      ->setReadOnly(TRUE);
+      ->setReadOnly(TRUE)
+      ->setSetting('unsigned', TRUE);
 
     $fields['uuid'] = FieldDefinition::create('uuid')
       ->setLabel(t('UUID'))
@@ -263,7 +264,8 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
 
     $fields['filesize'] = FieldDefinition::create('integer')
       ->setLabel(t('File size'))
-      ->setDescription(t('The size of the file in bytes.'));
+      ->setDescription(t('The size of the file in bytes.'))
+      ->setSetting('unsigned', TRUE);
 
     $fields['status'] = FieldDefinition::create('integer')
       ->setLabel(t('Status'))
diff --git a/core/modules/node/lib/Drupal/node/Entity/Node.php b/core/modules/node/lib/Drupal/node/Entity/Node.php
index 6dada8f..0e1d20f 100644
--- a/core/modules/node/lib/Drupal/node/Entity/Node.php
+++ b/core/modules/node/lib/Drupal/node/Entity/Node.php
@@ -335,7 +335,8 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
     $fields['nid'] = FieldDefinition::create('integer')
       ->setLabel(t('Node ID'))
       ->setDescription(t('The node ID.'))
-      ->setReadOnly(TRUE);
+      ->setReadOnly(TRUE)
+      ->setSetting('unsigned', TRUE);
 
     $fields['uuid'] = FieldDefinition::create('uuid')
       ->setLabel(t('UUID'))
@@ -345,7 +346,8 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
     $fields['vid'] = FieldDefinition::create('integer')
       ->setLabel(t('Revision ID'))
       ->setDescription(t('The node revision ID.'))
-      ->setReadOnly(TRUE);
+      ->setReadOnly(TRUE)
+      ->setSetting('unsigned', TRUE);
 
     $fields['type'] = FieldDefinition::create('entity_reference')
       ->setLabel(t('Type'))
diff --git a/core/modules/shortcut/lib/Drupal/shortcut/Entity/Shortcut.php b/core/modules/shortcut/lib/Drupal/shortcut/Entity/Shortcut.php
index eaf7079..9723a83 100644
--- a/core/modules/shortcut/lib/Drupal/shortcut/Entity/Shortcut.php
+++ b/core/modules/shortcut/lib/Drupal/shortcut/Entity/Shortcut.php
@@ -136,7 +136,8 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
     $fields['id'] = FieldDefinition::create('integer')
       ->setLabel(t('ID'))
       ->setDescription(t('The ID of the shortcut.'))
-      ->setReadOnly(TRUE);
+      ->setReadOnly(TRUE)
+      ->setSetting('unsigned', TRUE);
 
     $fields['uuid'] = FieldDefinition::create('uuid')
       ->setLabel(t('UUID'))
diff --git a/core/modules/system/lib/Drupal/system/Tests/Entity/EntityValidationTest.php b/core/modules/system/lib/Drupal/system/Tests/Entity/EntityValidationTest.php
index 118abe9..1346c7f 100644
--- a/core/modules/system/lib/Drupal/system/Tests/Entity/EntityValidationTest.php
+++ b/core/modules/system/lib/Drupal/system/Tests/Entity/EntityValidationTest.php
@@ -105,6 +105,12 @@ protected function checkValidation($entity_type) {
 
     // Test triggering a fail for each of the constraints specified.
     $test_entity = clone $entity;
+    $test_entity->id->value = -1;
+    $violations = $test_entity->validate();
+    $this->assertEqual($violations->count(), 1, 'Validation failed.');
+    $this->assertEqual($violations[0]->getMessage(), t('%name: The integer must be larger or equal to %min.', array('%name' => 'ID', '%min' => 0)));
+
+    $test_entity = clone $entity;
     $test_entity->uuid->value = $this->randomString(129);
     $violations = $test_entity->validate();
     $this->assertEqual($violations->count(), 1, 'Validation failed.');
diff --git a/core/modules/system/tests/modules/entity_test/lib/Drupal/entity_test/Entity/EntityTest.php b/core/modules/system/tests/modules/entity_test/lib/Drupal/entity_test/Entity/EntityTest.php
index 55a1611..fb1087f 100644
--- a/core/modules/system/tests/modules/entity_test/lib/Drupal/entity_test/Entity/EntityTest.php
+++ b/core/modules/system/tests/modules/entity_test/lib/Drupal/entity_test/Entity/EntityTest.php
@@ -65,7 +65,8 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
     $fields['id'] = FieldDefinition::create('integer')
       ->setLabel(t('ID'))
       ->setDescription(t('The ID of the test entity.'))
-      ->setReadOnly(TRUE);
+      ->setReadOnly(TRUE)
+      ->setSetting('unsigned', TRUE);
 
     $fields['uuid'] = FieldDefinition::create('uuid')
       ->setLabel(t('UUID'))
diff --git a/core/modules/system/tests/modules/entity_test/lib/Drupal/entity_test/Entity/EntityTestMulRev.php b/core/modules/system/tests/modules/entity_test/lib/Drupal/entity_test/Entity/EntityTestMulRev.php
index 870af93..1e6dc44 100644
--- a/core/modules/system/tests/modules/entity_test/lib/Drupal/entity_test/Entity/EntityTestMulRev.php
+++ b/core/modules/system/tests/modules/entity_test/lib/Drupal/entity_test/Entity/EntityTestMulRev.php
@@ -53,7 +53,8 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
     $fields['revision_id'] = FieldDefinition::create('integer')
       ->setLabel(t('Revision ID'))
       ->setDescription(t('The version id of the test entity.'))
-      ->setReadOnly(TRUE);
+      ->setReadOnly(TRUE)
+      ->setSetting('unsigned', TRUE);
 
     $fields['default_langcode'] = FieldDefinition::create('boolean')
       ->setLabel(t('Default language'))
diff --git a/core/modules/system/tests/modules/entity_test/lib/Drupal/entity_test/Entity/EntityTestRev.php b/core/modules/system/tests/modules/entity_test/lib/Drupal/entity_test/Entity/EntityTestRev.php
index b6b660e..8be477a 100644
--- a/core/modules/system/tests/modules/entity_test/lib/Drupal/entity_test/Entity/EntityTestRev.php
+++ b/core/modules/system/tests/modules/entity_test/lib/Drupal/entity_test/Entity/EntityTestRev.php
@@ -58,7 +58,8 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
     $fields['revision_id'] = FieldDefinition::create('integer')
       ->setLabel(t('Revision ID'))
       ->setDescription(t('The version id of the test entity.'))
-      ->setReadOnly(TRUE);
+      ->setReadOnly(TRUE)
+      ->setSetting('unsigned', TRUE);
 
     $fields['langcode']->setRevisionable(TRUE);
     $fields['name']->setRevisionable(TRUE);
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/Entity/Term.php b/core/modules/taxonomy/lib/Drupal/taxonomy/Entity/Term.php
index 4550acb..207f08b 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/Entity/Term.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/Entity/Term.php
@@ -111,7 +111,8 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
     $fields['tid'] = FieldDefinition::create('integer')
       ->setLabel(t('Term ID'))
       ->setDescription(t('The term ID.'))
-      ->setReadOnly(TRUE);
+      ->setReadOnly(TRUE)
+      ->setSetting('unsigned', TRUE);
 
     $fields['uuid'] = FieldDefinition::create('uuid')
       ->setLabel(t('UUID'))
@@ -150,7 +151,8 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
       ->setDescription(t('The parents of this term.'))
       // Save new terms with no parents by default.
       ->setSetting('default_value', 0)
-      ->setConstraints(array('TermParent' => array()));
+      ->setSetting('unsigned', TRUE)
+      ->addConstraint('TermParent', array());
 
     $fields['changed'] = FieldDefinition::create('changed')
       ->setLabel(t('Changed'))
diff --git a/core/modules/user/lib/Drupal/user/Entity/User.php b/core/modules/user/lib/Drupal/user/Entity/User.php
index 3c13a94..fc33baf 100644
--- a/core/modules/user/lib/Drupal/user/Entity/User.php
+++ b/core/modules/user/lib/Drupal/user/Entity/User.php
@@ -448,7 +448,8 @@ public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
     $fields['uid'] = FieldDefinition::create('integer')
       ->setLabel(t('User ID'))
       ->setDescription(t('The user ID.'))
-      ->setReadOnly(TRUE);
+      ->setReadOnly(TRUE)
+      ->setSetting('unsigned', TRUE);
 
     $fields['uuid'] = FieldDefinition::create('uuid')
       ->setLabel(t('UUID'))