UDC Online in the Spanish language "CDU Online Español" was released in January 2016 and is now opened for subscriptions. A two-week free trial is also available.
CDU Online Español represents the most comprehensive and most up-to-date UDC schedules in Spanish language to date. It contains over 70,000 classes of the most recent UDC release extended with 11,000 cancelled i.e. historical UDC numbers. The service is a result of collaboration between the UDC Consortium and AENOR.