diff --git a/include/mod_muc.hrl b/include/mod_muc.hrl
index f801b29e1..c8984f885 100644
--- a/include/mod_muc.hrl
+++ b/include/mod_muc.hrl
@@ -23,8 +23,9 @@
                    opts = [] :: list() | '_'}).
 
 -record(muc_registered,
-        {us_host = {{<<"">>, <<"">>}, <<"">>} :: {{binary(), binary()}, binary()} | '$1',
-         nick = <<"">> :: binary()}).
+        {us_host = {{<<"">>, <<"">>}, <<"">>} :: {{binary() | '$1', binary() | '$2'},
+                                                  binary() | '_'} | '$1',
+         nick = <<"">> :: binary() | '$3'}).
 
 -record(muc_online_room,
         {name_host :: {binary(), binary()} | '$1' | {'_', binary()} | '_',
diff --git a/src/mod_muc.erl b/src/mod_muc.erl
index 279156113..8d6601ddd 100644
--- a/src/mod_muc.erl
+++ b/src/mod_muc.erl
@@ -67,6 +67,8 @@
 	 count_online_rooms/1,
 	 register_online_user/4,
 	 unregister_online_user/4,
+	 get_register_nick/3,
+	 get_register_nicks/2,
 	 iq_set_register_info/5,
 	 count_online_rooms_by_user/3,
 	 get_online_rooms_by_user/3,
@@ -102,6 +104,7 @@
 -callback can_use_nick(binary(), binary(), jid(), binary()) -> boolean().
 -callback get_rooms(binary(), binary()) -> [#muc_room{}].
 -callback get_nick(binary(), binary(), jid()) -> binary() | error.
+-callback get_nicks(binary(), binary()) -> [{binary(), binary(), binary()}] | error.
 -callback set_nick(binary(), binary(), jid(), binary()) -> {atomic, ok | false}.
 -callback register_online_room(binary(), binary(), binary(), pid()) -> any().
 -callback unregister_online_room(binary(), binary(), binary(), pid()) -> any().
@@ -1107,6 +1110,16 @@ get_nick(ServerHost, Host, From) ->
     Mod = gen_mod:db_mod(LServer, ?MODULE),
     Mod:get_nick(LServer, Host, From).
 
+-spec get_register_nick(binary(), binary(), jid()) -> binary() | error.
+get_register_nick(ServerHost, Host, From) ->
+    get_nick(ServerHost, Host, From).
+
+-spec get_register_nicks(binary(), binary()) -> [{binary(), binary(), binary()}].
+get_register_nicks(ServerHost, Host) ->
+    LServer = jid:nameprep(ServerHost),
+    Mod = gen_mod:db_mod(LServer, ?MODULE),
+    Mod:get_nicks(LServer, Host).
+
 iq_get_register_info(ServerHost, Host, From, Lang) ->
     {Nick, Registered} = case get_nick(ServerHost, Host, From) of
 			     error -> {<<"">>, false};
diff --git a/src/mod_muc_mnesia.erl b/src/mod_muc_mnesia.erl
index 02ecb3ce8..86cc2d212 100644
--- a/src/mod_muc_mnesia.erl
+++ b/src/mod_muc_mnesia.erl
@@ -29,7 +29,7 @@
 
 %% API
 -export([init/2, import/3, store_room/5, restore_room/3, forget_room/3,
-	 can_use_nick/4, get_rooms/2, get_nick/3, set_nick/4]).
+	 can_use_nick/4, get_rooms/2, get_nick/3, get_nicks/2, set_nick/4]).
 -export([register_online_room/4, unregister_online_room/4, find_online_room/3,
 	 get_online_rooms/3, count_online_rooms/2, rsm_supported/0,
 	 register_online_user/4, unregister_online_user/4,
@@ -122,6 +122,14 @@ get_nick(_LServer, Host, From) ->
 	[#muc_registered{nick = Nick}] -> Nick
     end.
 
+get_nicks(_LServer, Host) ->
+    mnesia:dirty_select(muc_registered,
+                        [{#muc_registered{us_host = {{'$1', '$2'}, Host},
+                                          nick = '$3', _ = '_'},
+                          [],
+                          [{{'$1', '$2', '$3'}}]
+                         }]).
+
 set_nick(_LServer, ServiceOrRoom, From, Nick) ->
     {LUser, LServer, _} = jid:tolower(From),
     LUS = {LUser, LServer},
diff --git a/src/mod_muc_sql.erl b/src/mod_muc_sql.erl
index 31c8703c1..11ca5db0e 100644
--- a/src/mod_muc_sql.erl
+++ b/src/mod_muc_sql.erl
@@ -31,7 +31,7 @@
 %% API
 -export([init/2, store_room/5, store_changes/4,
          restore_room/3, forget_room/3,
-	 can_use_nick/4, get_rooms/2, get_nick/3, set_nick/4,
+	 can_use_nick/4, get_rooms/2, get_nick/3, get_nicks/2, set_nick/4,
 	 import/3, export/1]).
 -export([register_online_room/4, unregister_online_room/4, find_online_room/3,
 	 get_online_rooms/3, count_online_rooms/2, rsm_supported/0,
@@ -344,6 +344,23 @@ get_nick(LServer, Host, From) ->
 	_ -> error
     end.
 
+get_nicks(LServer, Host) ->
+    case catch ejabberd_sql:sql_query(LServer,
+                                      ?SQL("select @(jid)s, @(nick)s from muc_registered where"
+                                           " host=%(Host)s"))
+    of
+        {selected, Results} ->
+            lists:map(fun({JidBin, Nick}) ->
+                         {User, Server, _Resource} =
+                             jid:tolower(
+                                 jid:decode(JidBin)),
+                         {User, Server, Nick}
+                      end,
+                      Results);
+        _ ->
+            error
+    end.
+
 set_nick(LServer, ServiceOrRoom, From, Nick) ->
     JID = jid:encode(jid:tolower(jid:remove_resource(From))),
     F = fun () ->