diff --git a/php/servers/known-servers.php b/php/servers/known-servers.php
index f2afbea..69d9947 100644
--- a/php/servers/known-servers.php
+++ b/php/servers/known-servers.php
@@ -86,6 +86,16 @@
 		"46.101.253.18",
 		"womanbodybeauty+13f6",
 		"88.212.53.198:4080",
+		"aiunlimited+fc30",
+		"AlexMed+e093",
+		"gore+e5e0",
+		"internet+70d0",
+		"k9training+fdcb",
+		"dogmen+fdcb",
+		"RU-STEROID+e093",
+		"thestart+e4b1",
+		"deutschclub+e4b1",
+		"cocaine+e4b1",
 	];
 
 	/**
@@ -96,6 +106,17 @@
 		"AISFW+fc30",
 	];
 
+	/**
+	 * These rooms are intended for testing and not for a general userbase.
+	 */
+	$TESTING_INCLUDE = [
+		"fishing+8e2e",
+		"test+118d",
+		"test+13f6",
+		"test+fe93",
+		"xyz+7908",
+	];
+
 	$SERVER_ICON_MAPPING = [
 		"open.getsession.org" => "session",
 		"sog.caliban.org" => "privacy"
diff --git a/php/servers/servers-rooms.php b/php/servers/servers-rooms.php
index 7f2e526..04d93ad 100644
--- a/php/servers/servers-rooms.php
+++ b/php/servers/servers-rooms.php
@@ -113,6 +113,7 @@
 			$details = get_object_vars($this);
 			unset($details['server']);
 			$details['tags'] = $this->get_raw_tags();
+			$details['tags_custom'] = $this->get_derived_tags();
 			return $details;
 		}
 
@@ -362,13 +363,10 @@
 		}
 
 		/**
-		 * Return the tags associated with this room.
-		 * @return \CommunityTag[] Tags as string array.
+		 * Return the deroved tags associated with this room.
 		 */
-		function get_room_tags(): array {
-			global $ROOMS_USED_BY_PROJECT;
-
-			$user_tags = CommunityTag::from_user_tags($this->tags, remove_redundant: true);
+		function get_derived_tags(): array {
+			global $ROOMS_USED_BY_PROJECT, $TESTING_INCLUDE;
 
 			/**
 			 * @var \CommunityTag[] $derived_tags
@@ -454,7 +452,25 @@
 					);
 			}
 
-			return [...$derived_tags, ...$user_tags];
+			if ($this->matched_by_list($TESTING_INCLUDE)) {
+				$derived_tags[] =
+					new CommunityTag(
+						"test",
+						TagType::RESERVED_TAG,
+						"This Community is intended for testing only."
+					);
+			}
+
+			return $derived_tags;
+		}
+
+		/**
+		 * Return the tags associated with this room.
+		 * @return \CommunityTag[] Tags as string array.
+		 */
+		function get_room_tags(): array {
+			$user_tags = CommunityTag::from_user_tags($this->tags, remove_redundant: true);
+			return [...$this->get_derived_tags(), ...$user_tags];
 		}
 	}
 
diff --git a/php/servers/tags.php b/php/servers/tags.php
index 296fe56..1623088 100644
--- a/php/servers/tags.php
+++ b/php/servers/tags.php
@@ -161,7 +161,8 @@
 			"not modded",
 			"read-only",
 			"uploads off",
-			"we're here"
+			"we're here",
+			"test",
 		];
 
 		private const SHOWCASED_TAGS = ["official", "new", "we're here", "nsfw", "read-only"];