Pseudorandom generators are the main security tool in EPC Gen2 systems. Besides its statistical compliance with the standard, no further information is provided on its design, performance or generation scheme. We empirically analysed EPC Gen2 pseudorandom sequences using a novel experimental setup. From our analysis, we obtained evidences that pseudorandom number generators used in different commercial integrated circuits use the same algorithm. This paper presents the results of this analysis. Copyright © 2012 John Wiley & Sons, Ltd.