When designing technologies, networked systems, and measurements on theInternet, we must be aware of their implications and consequences for thesociety and participants. As engineers, scientists, programmers and otherexperts, we have moral obligations towards our peers, users of technologies wecreate, and the wider communities. In this talk I want to talk both about general ethical considerations, andspecific examples of moral dilemmas that come from building the RIPE Atlassystem, and conducting measurements that reveal workings of Internetinfrastructure and services. RIPE Atlas is an extensive measurement network, where the vantage points(sources of measurements) are hosted by volunteers: mostly individuals athome, but also some institutions (ISPs, IXPs, academia, various otherbusinesses). RIPE Atlas users are using someone else's Internet connection todo measurements.