diff --git a/README.md b/README.md
index 8e52a2f..c25f788 100644
--- a/README.md
+++ b/README.md
@@ -39,6 +39,7 @@ configure app preferences by editing `config.env` file
 |-----------------|---------------------------------------------|--------|--------|
 | MAX_LIFE_CONN   | maximum idle time connection before closed  | number | minute |
 | TICK_CLOSE_CONN | ticker interval to sweep expired connection | number | second |
+| BIND_ADDR       | ip:port to bind service                     | string |  |
 
 set value `0 (zero)` to disable auto close idle connection.
 
diff --git a/grpcox.go b/grpcox.go
index e10204a..47199bd 100644
--- a/grpcox.go
+++ b/grpcox.go
@@ -25,20 +25,23 @@ func main() {
 	log.SetFlags(log.LstdFlags | log.Lshortfile)
 
 	// start app
-	port := ":6969"
+	addr := "0.0.0.0:6969"
+	if value, ok := os.LookupEnv("BIND_ADDR"); ok {
+		addr = value
+	}
 	muxRouter := mux.NewRouter()
 	handler.Init(muxRouter)
 	var wait time.Duration = time.Second * 15
 
 	srv := &http.Server{
-		Addr:         "0.0.0.0" + port,
+		Addr:         addr,
 		WriteTimeout: time.Second * 15,
 		ReadTimeout:  time.Second * 15,
 		IdleTimeout:  time.Second * 60,
 		Handler:      muxRouter,
 	}
 
-	fmt.Println("Service started on", port)
+	fmt.Println("Service started on", addr)
 	go func() {
 		log.Fatal(srv.ListenAndServe())
 	}()