upn (which originally stood for the united paramount network) was a television network in over 200 places in the united states. upn was owned by cbs corporation, which also owns the larger cbs network. upn shut down on september 15, 2006, and was replaced with the cw, a joint venture between cbs corporation and the warner bros. division of time warner, which owned the wb before that network was also shut down in 2006 and merged with upn to create the cw.