Not necessarily, but operations within Class A, B, and C airspaces to include the airspaces above and below the B and C airspace including all airspace inside the Mode C ring. Additionally Class E 10,000 ft and above, or GOMEX operations 3,000 ft. and above will be required to equip. Furthermore, in order to receive the full Free benefits of the ADS-B IN you will need to become a valid client in the system to receive those benefits.