Which NetBoot Server Am I Booted From?

Is there a way I can tell which NetBoot server a client machine has booted off of, from within the client machine itself? This is kind of an obscure question, but I am in an environment that has two identical NetBoot servers. On the Startup Disk System Pref pane, each NetBoot 'volume' has the server IP address associated with it. But once the client has booted, is there a way I can determine which server it used/is using?