UBR may refer to: Unspecified Bit Rate, a traffic contract used to guarantee quality of service for networks Universal broadband router, an alternate name for a cable modem termination system Uniform Business Rate, see Business rates in England and Wales "U.B.R. (Unauthorized Biography of Rakim)", a song by Nas from the album Street's Disciple Unmatched Brutality Records University Boat Race Ubrub Airport, Indonesia (by IATA airport code) UDDI Business Registry (UBR), also known as the Public Cloud, is a conceptually single system built from multiple nodes having their data synchronized through replication.