When The Anarchical Society was published in 1977, the world was on the doorstep of seismic technological change. Forty years later, the information age has placed cyber security at the centre of many global political concerns including armed conflict and international law. The ongoing difficulties associated with accurately attributing cyber attacks introduce a new dimension of anarchy in international relations. This essay draws on Bull’s ideas about social interplay to explore the problem of attribution in cyberspace. It finds that the difficulties of identifying (even) state actors undermine some of the processes and institutions upon which Bull based his ideas. However, it also finds that Bull’s work is useful in unpicking exactly why attribution is so problematic for international relations. Ultimately, Bull’s expectation that actors will look for social solutions to maintain order appears to be holding up in the information age much as it did in the industrial age.