Cable One, Inc. is an American broadband communications provider. Under the Sparklight brand, it provides service to 21 states and 900,000 residential and business customers. It is headquartered in Phoenix, Arizona, though it does not serve that metro area. A former subsidiary of Graham Holdings Company, its name was changed in 1997 from Post-Newsweek Cable. Sparklight provides broadband service via cable (DOCSIS) through most of its footprint, and fiber-to-the-home in limited areas.