Despite the success of Nick at Nite in the United States, most international versions of Nickelodeon do not carry their own Nick at Nite programming block, as those local versions of Nickelodeon outside of the United States either carry children's programming 24 hours a day or run a non-Nick at Nite program block during the nighttime hours. While Nick at Nite's U.S. flagship primarily focuses on reruns of discontinued primetime network sitcoms, some of these international versions have aired reruns of discontinued Nickelodeon series.