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Energy conservation has been the key focus of research in low-rate wireless personal area networks (WPANs).Several algorithms have been proposed to dynamically adjust the duty cycle of nodes in beacon-enabled WPANs. Increasing beacon interval for lowering the duty cycle of end devices decreases the probability of fast node association, when passive scan is used. Moreover, the requirement of performing coordinator discovery increases with mobility of end devices because of frequent cell changes. In this paper, we propose a scheme for facilitating prompt passive discovery of coordinator(s) by mobile end devices. Simulation analysis has shown that proposed scheme can swiftly discover the coordinator(s) irrespective of beacon interval length.