Qwest Corporation (CTDD), doing business as CenturyLink QC, operates as a facilities-based regional telecommunications provider and subsidiary of Lumen Technologies, offering integrated communications products and services including low- and high-speed broadband internet; local and long-distance voice services; professional and ancillary services such as federal broadband and state support programs; and high-bandwidth optical wavelength networks with Ethernet technology for enterprise connectivity and cloud access, primarily marketed under the Lumen brand to residential, business, governmental, and wholesale customers across 14 western and midwestern U.S. states including Arizona, Colorado, Idaho, Iowa, Minnesota, Montana, Nebraska, New Mexico, North Dakota, Oregon, South Dakota, Utah, Washington, and Wyoming. Founded in 1911 as the Mountain States Telephone and Telegraph Company and headquartered in Monroe, Louisiana, the company traces its lineage through Mountain Bell, US West Communications (formed 1991), and a 2000 acquisition by Qwest Communications International which prompted its name change from US West; it underwent a major restructuring in 2011 via CenturyLink's acquisition of Qwest, followed by CenturyLink's rebranding to Lumen Technologies in 2020 and recent note redemptions including $235 million of Qwest 2056 notes in 2021 as part of ongoing debt management.