The legally required imprint (Impressum, § 5 DDG) is available in German only:
In short: this website is operated by RWTH Aachen University, represented by its Rector; responsible for its content is the Chair of Communication and Distributed Systems (COMSYS, Prof. Dr.-Ing. Klaus Wehrle), Ahornstr. 55, 52074 Aachen, Germany. The German version is authoritative.