Jus Internet is an ethics-based legal regime for cyberspace. It resolves to Roman jus gentium that evolved into today’s public international law. Originally a set of customary regulations shaping mutual relations among the numerous Roman non-citizens, jus gentium regulated interactions among representatives of different ethical and historical backgrounds. Today cyberspace resembles that forum of the clash of cultures that once was the wide-spanning Roman empire. In cyberspace the place of fides and aequitas, essential to jus gentium, may be taken over by ethics (including international consensus on human rights scope) and computer code. Based on those two elements a new set of customary law rules – jus Internet – may be elaborated.