Broadcasting on 860 AM, XEUN-AM is owned by the National Autonomous University of Mexico (UNAM) as a sister to XEUN-FM 96.1 and XHUNAM-TDT 20.

On June 14, 1937, the Cultural Broadcasting Administration of UNAM was formed, and rector Luis Chico Goerne officially dedicated the facilities of the university's new radio station on Justo Sierra 16 in Mexico City.

At the same time, UNAM shortwave radio signed on, as XEYU 9.6 MHz with 1,000 watts of power.

The station's facilities moved in 1958 to the Technical Office Building on the UNAM campus.

XEUN-FM signed on July 16, 1959, from a transmitter located on the Torre Rectoría (Rectory Tower).