symfony
diff --git a/‎src/Symfony/Component/Uid/CHANGELOG.md
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diff --git a/‎src/Symfony/Component/Uid/Uuid.php
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+7Lines changed: 7 additions & 0 deletions b/‎src/Symfony/Component/Uid/Uuid.php
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@@ -6,6 +6,7 @@ CHANGELOG
 
  * Add `AbstractUid::fromBinary()`, `AbstractUid::fromBase58()`, `AbstractUid::fromBase32()` and `AbstractUid::fromRfc4122()`
  * [BC BREAK] Replace `UuidV1::getTime()`, `UuidV6::getTime()` and `Ulid::getTime()` by `UuidV1::getDateTime()`, `UuidV6::getDateTime()` and `Ulid::getDateTime()`
+ * Add `Uuid::NAMESPACE_*` constants from RFC4122
 
 5.2.0
 -----
 
@@ -15,9 +15,16 @@
  * @experimental in 5.3
  *
  * @author Grégoire Pineau <lyrixx@lyrixx.info>
+ *
+ * @see https://tools.ietf.org/html/rfc4122#appendix-C for details about namespaces
  */
 class Uuid extends AbstractUid
 {
+    public const NAMESPACE_DNS = '6ba7b810-9dad-11d1-80b4-00c04fd430c8';
+    public const NAMESPACE_URL = '6ba7b811-9dad-11d1-80b4-00c04fd430c8';
+    public const NAMESPACE_OID = '6ba7b812-9dad-11d1-80b4-00c04fd430c8';
+    public const NAMESPACE_X500 = '6ba7b814-9dad-11d1-80b4-00c04fd430c8';
+
     protected const TYPE = 0;
 
     public function __construct(string $uuid)