From RFID tag ID to IPv6 address mapping mechanism Everyday objects are generating a large amount of data that should be stored in the memories of their chips and communicated to a reader. One of the most important technologies used in the internet of things is RFID. Radio Frequency Identification RFID is increasingly used in various applications because of their high quality as well as their low costs. However how can RFID tags communicate via the internet while it doesn’t own a network address? In this sense several methods of address translation have been proposed in the literature to increase the efficiency and the effectiveness of communications. In this paper we propose an algorithm based on the logic operator XOR to construct the IPv6 address of tags using the reader IPv6 address.