MRN is one of the two main radio broadcasters of the NASCAR Cup Series and Xfinity Series, covering events held at tracks owned by ISC, along with Dover International Speedway and Pocono Raceway. It also broadcasts the NASCAR All-Star Race, and the entire Truck Series season (although clearance of Xfinity and Truck Series events may vary by station). Almost all of the remaining races are broadcast by the Speedway Motorsports-owned Performance Racing Network (PRN), besides the Brickyard 400 (which is broadcast by the Indianapolis Motor Speedway Radio Network in association with PRN); many stations have affiliations with both MRN and PRN in order to air a full NASCAR schedule. All races are also carried on Sirius XM NASCAR Radio.