The eleventh annual report of the administrator of the international transaction log (ITL) provides information to the Conference of the Parties serving as the meeting of the Parties to the Kyoto Protocol (CMP) on the activities of the ITL administrator in the period from 1 October 2014 to 30 September 2015. The report also contains information on transactions of Kyoto Protocol units, as requested at CMP 6, as well as information on the outcomes of the 17th Registry System Administrators Forum, which took place on 17 and 18 September 2015 in Bonn, Germany. The CMP, by decision 12/CMP.1, requested the Subsidiary Body for Implementation (SBI) to consider, at its future sessions, the annual reports of the ITL administrator. The SBI may wish to take note of the information contained in this report and to provide guidance to the secretariat and Parties, as necessary, concerning the implementation of registry systems.