DZRB (738 AM), on-air as Radyo Pilipinas (RP1), is a radio station owned and operated by the Philippine Broadcasting Service, an agency under the Presidential Communications Operations Office. It serves as the flagship station of the Radyo Pilipinas network. The station's studios are located at the 4/F, PIA/Media Center Building, Visayas Ave., Brgy. Vasra, Diliman, Quezon City, and its transmitter is located at Brgy. Marulas, Valenzuela City. It operates from 4am to 10pm on weekdays and 4am to 8pm on weekends.