Class D
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Class D can mean either:
- Class D amplifier, a category of electronic amplifier
- Class D addresses, a type of Internet Protocol address
- Class D planet classification, from the fictional Star Trek universe
- Class D airspace as defined by the ICAO
- Class D substance
- Class D felony
- Class D permit
- A class of driver's license
- In radio broadcasting in the United States, Class D can mean either:
- a low-power FM station or translator; or
- an AM station which operates at full power during the daytime but must lower its power at night in order to protect other stations on the same frequency from interference.
- For a better explanation, see the list of broadcast station classes.