diff --git a/cmd/ba/main.go b/cmd/ba/main.go
index 7f3748b..d458c11 100644
--- a/cmd/ba/main.go
+++ b/cmd/ba/main.go
@@ -86,6 +86,7 @@ func makeapp() *cli.App {
 				cli.StringFlag{Name: "host", Value: "", Usage: "IP serving the trainer; required"},
 				cli.StringSliceFlag{Name: "agent", Usage: "Agent images"},
 				cli.IntFlag{Name: "port", Value: 8080, Usage: "Port serving the trainer"},
+				cli.StringFlag{Name: "viz-host", Value: "127.0.0.1", Usage: "Specify a host for the visualization server"},
 				cli.StringFlag{Name: "record-file", Value: "", Usage: "Destination file for recording the game"},
 				cli.StringFlag{Name: "map", Value: "hexagon", Usage: "Name of the map used by the trainer"},
 				cli.BoolFlag{Name: "no-browser", Usage: "Disable automatic browser opening at start"},
@@ -99,6 +100,7 @@ func makeapp() *cli.App {
 				host := c.String("host")
 				agents := c.StringSlice("agent")
 				port := c.Int("port")
+				vizhost := c.String("viz-host")
 				recordFile := c.String("record-file")
 				mapName := c.String("map")
 				nobrowser := c.Bool("no-browser")
@@ -111,6 +113,7 @@ func makeapp() *cli.App {
 					tps,
 					host,
 					port,
+					vizhost,
 					nobrowser,
 					recordFile,
 					agents,
diff --git a/subcommand/train/main.go b/subcommand/train/main.go
index 1bc12f4..8837e4a 100644
--- a/subcommand/train/main.go
+++ b/subcommand/train/main.go
@@ -55,6 +55,7 @@ func TrainAction(
 	tps int,
 	host string,
 	vizport int,
+	vizhost string,
 	nobrowser bool,
 	recordFile string,
 	agentimages []string,
@@ -224,7 +225,7 @@ func TrainAction(
 	vizgames[0] = viztypes.NewVizGame(game, gamedescription)
 
 	vizservice := visualization.NewVizService(
-		"127.0.0.1:"+strconv.Itoa(vizport),
+		vizhost+":"+strconv.Itoa(vizport),
 		mapName,
 		func() ([]*viztypes.VizGame, error) { return vizgames, nil },
 		recorder,
@@ -239,7 +240,7 @@ func TrainAction(
 		utils.FailWith(startErr)
 	}
 
-	url := "http://localhost:" + strconv.Itoa(vizport) + "/arena/1"
+	url := "http://" + vizhost + ":" + strconv.Itoa(vizport) + "/arena/1"
 
 	if !nobrowser {
 		open.Run(url)