Index: network.c
===================================================================
--- network.c	(revision 3982)
+++ network.c	(working copy)
@@ -1228,6 +1228,12 @@
 		if (_network_udp_broadcast > 0)
 			_network_udp_broadcast--;
 	}
+	
+	// check for updates to the network game list
+	if (!_network_udp_server && _network_gamelist_next_check < _tick_counter)
+	{
+		NetworkGameListUpdate();
+	}
 }
 
 // The main loop called from ttd.c
Index: network.h
===================================================================
--- network.h	(revision 3982)
+++ network.h	(working copy)
@@ -45,6 +45,10 @@
 #define NETWORK_VEHICLE_TYPES 5
 #define NETWORK_STATION_TYPES 5
 
+// game list related
+#define GAMELIST_SERVER_CHECK_LOOP_INTERVAL 150 // how often to call the gamelist update loop (in ticks)
+#define GAMELIST_SERVER_UPDATE_INTERVAL 3000 //how often to update servers in the list (in ticks)
+
 enum {
 	NETWORK_NAME_LENGTH        = 80,
 	NETWORK_HOSTNAME_LENGTH    = 80,
@@ -118,6 +122,7 @@
 	bool online;																		// False if the server did not respond (default status)
 	bool manually;																	// True if the server was added manually
 	struct NetworkGameList *next;
+	uint16 next_check;
 } NetworkGameList;
 
 typedef enum {
@@ -208,6 +213,8 @@
 
 VARDEF uint16 _network_restart_game_date;    // If this year is reached, the server automaticly restarts
 
+VARDEF uint16 _network_gamelist_next_check;
+
 NetworkGameList *NetworkQueryServer(const char* host, unsigned short port, bool game_info);
 
 byte NetworkSpectatorCount(void);
Index: network_udp.c
===================================================================
--- network_udp.c	(revision 3982)
+++ network_udp.c	(working copy)
@@ -563,10 +563,14 @@
 
 	// Clear item in gamelist
 	item = NetworkGameListAddItem(inet_addr(inet_ntoa(out_addr.sin_addr)), ntohs(out_addr.sin_port));
-	memset(&item->info, 0, sizeof(item->info));
-	snprintf(item->info.server_name, sizeof(item->info.server_name), "%s", hostname);
-	snprintf(item->info.hostname, sizeof(item->info.hostname), "%s", hostname);
-	item->online = false;
+	if (strlen(item->info.server_name) == 0)
+	{	
+		memset(&item->info, 0, sizeof(item->info));
+		snprintf(item->info.server_name, sizeof(item->info.server_name), "%s", hostname);
+		snprintf(item->info.hostname, sizeof(item->info.hostname), "%s", hostname);
+		item->online = false;
+	}
+	item->next_check = _tick_counter + GAMELIST_SERVER_UPDATE_INTERVAL;
 
 	// Init the packet
 	p = NetworkSend_Init(PACKET_UDP_CLIENT_FIND_SERVER);
@@ -671,6 +675,7 @@
 
 	_network_udp_server = false;
 	_network_udp_broadcast = 0;
+	_network_gamelist_next_check = 0;
 }
 
 #endif /* ENABLE_NETWORK */
Index: network_gamelist.c
===================================================================
--- network_gamelist.c	(revision 3982)
+++ network_gamelist.c	(working copy)
@@ -3,6 +3,8 @@
 #include "stdafx.h"
 #include "debug.h"
 #include "network_data.h"
+#include "network_udp.h"
+#include "variables.h"
 
 #ifdef ENABLE_NETWORK
 
@@ -63,4 +65,27 @@
 	}
 }
 
+/** Periodically check any offline servers for updates */
+void NetworkGameListUpdate(void)
+{
+	NetworkGameList *item;
+		
+	for (item = _network_game_list; item != NULL; item = item->next) {
+		if (item->online == false)
+		{
+			NetworkUDPQueryServer(item->info.hostname, item->port);
+			DEBUG(net, 6)("[NET][GameList] Queried inactive server %s:%d", item->info.hostname, item->port);
+		}
+		if (item->next_check < _tick_counter)
+		{
+			NetworkUDPQueryServer(item->info.hostname, item->port);
+			DEBUG(net, 6)("[NET][GameList] Requeried server %s:%d", item->info.hostname, item->port);		
+		}
+	}
+	
+	DEBUG(net, 4)("[NET][GameList] Ran update gamelist loop");
+	
+	_network_gamelist_next_check = _tick_counter + GAMELIST_SERVER_CHECK_LOOP_INTERVAL;
+}
+
 #endif /* ENABLE_NETWORK */
Index: network_gamelist.h
===================================================================
--- network_gamelist.h	(revision 3982)
+++ network_gamelist.h	(working copy)
@@ -7,5 +7,6 @@
 NetworkGameList *NetworkGameListAddItem(uint32 ip, uint16 port);
 void NetworkGameListRemoveItem(NetworkGameList *remove);
 void NetworkGameListAddQueriedItem(const NetworkGameInfo *info, bool server_online);
+void NetworkGameListUpdate(void);
 
 #endif /* NETWORK_GAMELIST_H */