Nickelodeon, often simply called Nick and originally called The Pinwheel Network, is an American children's channel owned by Viacom and operated under its Nickelodeon Kids and Family Group. The channel is primarily aimed at children in grade school and high school (ages 6–15), with their weekday morning program block aimed at preschoolers ages 2–5. Since 2004, Nickelodeon has been run by Cyma Zarghami. It is ranked as the #1 cable channel as of 2011. Nickelodeon's broadcast day runs on Sundays from 6 a.m.- 8 p.m., Monday-Thursdays from 7 a.m.-8 p.m., Fridays from 7 a.m.-9 p.m., and Saturdays from 6 a.m.-10 p.m. (Eastern and Pacific Time). Since 1985, it shares its channel space with Nick at Nite, a night time channel that airs sitcom reruns during the interim hours. It is treated as a separate channel from Nickelodeon by A.C. Nielsen Co. for ratings purposes. If you are not in the U.S, Nickelodeon will redirect you to the your region or country's website.