The term Class D may refer to: Class D (baseball), a defunct class in minor league baseball in North America Class-D amplifier or switching amplifier Class D fire extinguisher Class D league, a classification of minor league baseball from 1902 to 1962 Class D star, a stellar classification Class D, IP addresses on a classful network Class D, an airspace class as defined by the ICAO Class D, a type of Driver's license in the United States Class D, a North American broadcast station class Class-D, a type of character in the video game SCP – Containment Breach See also D class (disambiguation) D (disambiguation)