: Radio Frequency Identification (RFID) technology has a lot of potential to bridge the gap between the virtual world of enterprise IT systems and the real world of products and logistical units. In this paper we analyse the requirements RFID middleware solutions have to meet in order to manage large deployments of RFID readers and the amount of RFID data these readers capture. We also present the RFIDStack – an RFID middleware platform that does not only focus on the application needs, but also considers the constraints imposed by passive RFID technology.