diff --git a/lib/ildus/server/handler.rb b/lib/ildus/server/handler.rb
index 08dca06..efa0251 100644
--- a/lib/ildus/server/handler.rb
+++ b/lib/ildus/server/handler.rb
@@ -177,9 +177,14 @@ module Ildus
         end
       end
 
-      def updt_cmd(host, addr)
+      def updt_cmd(host, addr=nil)
         raise NotAuthError unless @account.authenticated?
-        addr = IPAddr.new(addr)
+        if addr.nil?
+          addr = Socket.getnameinfo(@io.getpeername).first
+          addr = IPAddr.new(addr)
+        else
+          addr = IPAddr.new(addr)
+        end
         @commit ||= @domain.update_host(host, addr)
       rescue HostNotFoundError
         prot_msg 425, host