Very often you have to make the choice between physical and logical concepts. The most obvious example of this is whether to use host names or IP addresses in URIs. Ideally we want to support both (see Future directions), but until we do, in general we chose to favor logical representations over physical ones, at least when there are no other compelling arguments to sway the decision either way. That means preferring host names over IP addresses in general. If you don't have a meaningful host name for the device however, don't make one up -- just use the IP address until you do have something better.