diff --git a/reference/constraints/Url.rst b/reference/constraints/Url.rst
index cce458a6538..056b441812a 100644
--- a/reference/constraints/Url.rst
+++ b/reference/constraints/Url.rst
@@ -9,8 +9,6 @@ Validates that a value is a valid URL string.
 | Options        | - `message`_                                                        |
 |                | - `protocols`_                                                      |
 |                | - `payload`_                                                        |
-|                | - `checkDNS`_                                                       |
-|                | - `dnsMessage`_                                                     |
 +----------------+---------------------------------------------------------------------+
 | Class          | :class:`Symfony\\Component\\Validator\\Constraints\\Url`            |
 +----------------+---------------------------------------------------------------------+
@@ -225,147 +223,3 @@ the ``ftp://`` type URLs to be valid, redefine the ``protocols`` array, listing
         }
 
 .. include:: /reference/constraints/_payload-option.rst.inc
-
-checkDNS
-~~~~~~~~
-
-**type**: ``boolean`` **default**: ``false``
-
-By default, this constraint just validates the syntax of the given URL. If you
-also need to check whether the associated host exists, set the ``checkDNS``
-option to ``true``:
-
-.. configuration-block::
-
-    .. code-block:: php-annotations
-
-        // src/Entity/Author.php
-        namespace App\Entity;
-
-        use Symfony\Component\Validator\Constraints as Assert;
-
-        class Author
-        {
-            /**
-             * @Assert\Url(
-             *    checkDNS = true
-             * )
-             */
-             protected $bioUrl;
-        }
-
-    .. code-block:: yaml
-
-        # config/validator/validation.yaml
-        App\Entity\Author:
-            properties:
-                bioUrl:
-                    - Url: { checkDNS: true }
-
-    .. code-block:: xml
-
-        <!-- config/validator/validation.xml -->
-        <?xml version="1.0" encoding="UTF-8" ?>
-        <constraint-mapping xmlns="http://symfony.com/schema/dic/constraint-mapping"
-            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-            xsi:schemaLocation="http://symfony.com/schema/dic/constraint-mapping http://symfony.com/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd">
-
-            <class name="App\Entity\Author">
-                <property name="bioUrl">
-                    <constraint name="Url">
-                        <option name="checkDNS">true</option>
-                    </constraint>
-                </property>
-            </class>
-        </constraint-mapping>
-
-    .. code-block:: php
-
-        // src/Entity/Author.php
-        namespace App\Entity;
-
-        use Symfony\Component\Validator\Mapping\ClassMetadata;
-        use Symfony\Component\Validator\Constraints as Assert;
-
-        class Author
-        {
-            public static function loadValidatorMetadata(ClassMetadata $metadata)
-            {
-                $metadata->addPropertyConstraint('bioUrl', new Assert\Url(array(
-                    'checkDNS'  => true,
-                )));
-            }
-        }
-
-This option uses the :phpfunction:`checkdnsrr` PHP function to check the validity
-of the ``ANY`` DNS record corresponding to the host associated with the given URL.
-
-dnsMessage
-~~~~~~~~~~
-
-**type**: ``string`` **default**: ``The host could not be resolved.``
-
-This message is shown when the ``checkDNS`` option is set to ``true`` and the
-DNS check failed.
-
-.. configuration-block::
-
-    .. code-block:: php-annotations
-
-        // src/Entity/Author.php
-        namespace App\Entity;
-
-        use Symfony\Component\Validator\Constraints as Assert;
-
-        class Author
-        {
-            /**
-             * @Assert\Url(
-             *    dnsMessage = "The host '{{ value }}' could not be resolved."
-             * )
-             */
-             protected $bioUrl;
-        }
-
-    .. code-block:: yaml
-
-        # config/validator/validation.yaml
-        App\Entity\Author:
-            properties:
-                bioUrl:
-                    - Url: { dnsMessage: 'The host "{{ value }}" could not be resolved.' }
-
-    .. code-block:: xml
-
-        <!-- config/validator/validation.xml -->
-        <?xml version="1.0" encoding="UTF-8" ?>
-        <constraint-mapping xmlns="http://symfony.com/schema/dic/constraint-mapping"
-            xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-            xsi:schemaLocation="http://symfony.com/schema/dic/constraint-mapping http://symfony.com/schema/dic/constraint-mapping/constraint-mapping-1.0.xsd">
-
-            <class name="App\Entity\Author">
-                <property name="bioUrl">
-                    <constraint name="Url">
-                        <option name="dnsMessage">The host "{{ value }}" could not be resolved.</option>
-                    </constraint>
-                </property>
-            </class>
-        </constraint-mapping>
-
-    .. code-block:: php
-
-        // src/Entity/Author.php
-        namespace App\Entity;
-
-        use Symfony\Component\Validator\Mapping\ClassMetadata;
-        use Symfony\Component\Validator\Constraints as Assert;
-
-        class Author
-        {
-            public static function loadValidatorMetadata(ClassMetadata $metadata)
-            {
-                $metadata->addPropertyConstraint('bioUrl', new Assert\Url(array(
-                     'dnsMessage' => 'The host "{{ value }}" could not be resolved.',
-                )));
-            }
-        }