diff --git a/core/smn_halflife.cpp b/core/smn_halflife.cpp
index b27a7e4f..c49c6431 100644
--- a/core/smn_halflife.cpp
+++ b/core/smn_halflife.cpp
@@ -572,6 +572,47 @@ static cell_t ReferenceToBCompatRef(IPluginContext *pContext, const cell_t *para
 	return g_HL2.ReferenceToBCompatRef(params[1]);
 }
 
+// Must match ClientRangeType enum in halflife.inc
+enum class ClientRangeType : cell_t
+{
+	Visibility = 0,
+	Audibility,
+};
+
+static cell_t GetClientsInRange(IPluginContext *pContext, const cell_t *params)
+{
+	cell_t *origin;
+	pContext->LocalToPhysAddr(params[1], &origin);
+
+	Vector vOrigin(sp_ctof(origin[0]), sp_ctof(origin[1]), sp_ctof(origin[2]));
+
+	ClientRangeType rangeType = (ClientRangeType) params[2];
+
+	CBitVec<ABSOLUTE_PLAYER_LIMIT> players;
+	engine->Message_DetermineMulticastRecipients(rangeType == ClientRangeType::Audibility, vOrigin, players);
+
+	cell_t *outPlayers;
+	pContext->LocalToPhysAddr(params[3], &outPlayers);
+
+	int maxPlayers = params[4];
+	int curPlayers = 0;
+
+	int index = players.FindNextSetBit(0);
+	while (index > -1 && curPlayers < maxPlayers)
+	{
+		int entidx = index + 1;
+		CPlayer *pPlayer = g_Players.GetPlayerByIndex(entidx);
+		if (pPlayer && pPlayer->IsInGame())
+		{
+			outPlayers[curPlayers++] = entidx;
+		}
+
+		index = players.FindNextSetBit(index + 1);
+	}
+
+	return curPlayers;
+}
+
 REGISTER_NATIVES(halflifeNatives)
 {
 	{"CreateFakeClient",		CreateFakeClient},
@@ -607,5 +648,6 @@ REGISTER_NATIVES(halflifeNatives)
 	{"EntIndexToEntRef",		IndexToReference},
 	{"EntRefToEntIndex",		ReferenceToIndex},
 	{"MakeCompatEntRef",		ReferenceToBCompatRef},
+	{"GetClientsInRange",		GetClientsInRange},
 	{NULL,						NULL},
 };
diff --git a/plugins/include/halflife.inc b/plugins/include/halflife.inc
index 22cc9d30..4514bb08 100644
--- a/plugins/include/halflife.inc
+++ b/plugins/include/halflife.inc
@@ -624,3 +624,21 @@ native EntRefToEntIndex(ref);
  */
 native MakeCompatEntRef(ref);
 
+
+enum ClientRangeType
+{
+	RangeType_Visibility = 0,
+	RangeType_Audibility,
+}
+
+/**
+ * Find clients that are potentially in range of a position.
+ *
+ * @param origin		Coordinates from which to test range.
+ * @param rangeType		Range type to use for filtering clients.
+ * @param clients		Array to which found client indexes will be written.
+ * @param size			Maximum size of clients array.
+ * @return				Number of client indexes written to clients array.
+ */
+native int GetClientsInRange(float origin[3], ClientRangeType rangeType, int[] clients, int size);
+