Jurisdiction, which constitutes the foundation of a state's rights based on sovereignty, has played a significant role in the development of international law. The Westphalian classical system viewed state jurisdiction as the authority within state territories, which was essential at the time to avoid jurisdictional conflicts among states. Nevertheless, in the contemporary global context, states possess the capacity to exercise jurisdiction beyond their territorial boundaries under specific circumstances. The fundamental principle of international law stipulates that states may only exert extraterritorial jurisdiction in accordance with established international norms. These norms necessitate a specific connection for applying these competencies, with jurisdiction-based registration being a predominant method. The use of jurisdiction derived from registration varies, especially in ABNJ. This study aims to examine extraterritorial jurisdiction in the ABNJ. The initial section provides a broad definition of jurisdiction. Subsequently, the study explores the relationship between registration and jurisdiction, focusing on international law of the sea, international air law, regulations pertaining to Antarctica, and space law.