CORDIS, the European Commission's Research and Development Information Service, is hosting the results of a survey on nanotechnology research networks. More than 50 national and international networks are listed in the directory, including a network of 570 partners. The site also contains direct access to scientific information and contact details. This directory of networks, hosted on the nanotechnology thematic service, offers information about the research objectives, partners and the scientific fields of activity. This new tool enables users to identify networks as well as to exchange and develop knowledge, tools, techniques and expertise. Synthetic reports give an overview of and statistical information on the networks by country and fields of activity. The downloadable database documents will be updated and opened for new networks. To this end, a questionnaire is available for the registration of additional networks. This European initiative supports the efforts to strengthen interaction between the European Commission and Member State activities in the frame of the European research and innovation area. The database of networks will be useful to the scientific community and should facilitate coordination, information exchange and synergy in the field of nanotechnology.