Antarctica

Antarctica's sole domain extension, .aq, is one of the most restricted ccTLDs in the world. Administered by the Council of Managers of National Antarctic Programs (COMNAP), .aq registration is limited to organizations that conduct research or have operations on the Antarctic continent as defined by the Antarctic Treaty System. With only a few hundred active registrations, .aq is among the rarest TLDs in existence. The domain serves as a digital identifier for polar research stations, scientific expeditions, and intergovernmental bodies working on the southernmost continent.