As interstate cyberconflict intensifies, the intersection of national security, cybersecurity, and International Relations (IR) theory has emerged as a critical venue for scholarly inquiry. Yet due mainly to epistemological problems, IR theory has been limited in examining how it informs the maximization of strategic cyberpower and in testing key realist concepts and assumptions against cyberactualities, risking theoretical stagnation and conceptual infertility in the study of statecraft and cybersecurity. I seek to bridge these theory-testing and conceptual gaps by assessing offensive realism’s assumption about the scope of hegemonic expansion in cyberspace using the crucial case of the United States. I argue that offensive realism has meaningful explanatory and predictive power in cyberspace but sometimes lacks this power under conditions assumed by the theory, emphasizing the need to modify offensive realism’s understanding and scope conditions of hegemony. The US pursues global, not regional, cyberhegemony using offensive strategies to maximize its cyberpower for cybersecurity. Therefore, I critically examine defensive realism and cyber persistence theory as alternative structural perspectives on the pursuit of security in cyberspace and introduce a modified conceptual framework for hegemony to adapt offensive realism to cyber-realities. This conceptual innovation can potentially contribute to policy making and help to build a cyber-specific version of offensive realism.