XO Holdings operates through its subsidiary, XO Communications, LLC, which provides a range of telecommunications services in the United States and internationally. The company manages an integrated fiber optic network that delivers various networking solutions, including bandwidth on demand, wide area networking, and Internet access. It specializes in unified communications, offering services such as hosted PBX, voice over IP, and traditional voice services. Additionally, XO Communications provides cloud computing, colocation, and managed services, along with security solutions and wholesale services targeting telecommunications carriers and other service providers. Its clientele includes enterprise, small, and medium businesses across various sectors, such as finance, healthcare, media, and retail. Founded in 2000 and headquartered in Herndon, Virginia, XO Communications operates as a subsidiary of Verizon Communications Inc.