|Founded||July 4, 1996Bellevue, Washingtonin|
|Headquarters||Herndon, Virginia, U.S.|
|Primarily the United States, South America, Europe, Middle East, Asia and Oceania|
|Products||VoIP services, Network Services, Hosted Services, Carrier / Wholesale|
XO Communications (previously Nextlink Communications, Concentric Network Corporation and Allegiance Telecom, Inc. is a telecommunications company owned by XO Holdings, Inc ( OTCBB: XOHO). XO provides managed and converged Internet Protocol (IP) network services for small and medium-sized enterprises.  XO delivers services through a mix of fiber-based Ethernet and Ethernet over Copper (EoC).  In addition, the company has external network-to-network interface (E-NNI) agreements with traditional carriers and cable companies. 
In a news release dated February 22, 2016, Verizon announced plans to acquire XO Communications' "fiber-optic network business."   A combined Verizon-XO offering is expected to be offered in June 2017 by a business unit for small businesses and government markets. [ needs update]
- "XO Communications, LLC". www.bloomberg.com. Bloomberg. Retrieved 8 August 2017.
- Buckley, Sean. "Level 3, tw telecom, other CLECs step up to Ethernet plate". FierceTelecom. Retrieved 8 August 2017.
- Bob Varettoni (22 February 2016). "Verizon continues focus on network superiority with agreement to purchase XO Communications' fiber business". Verizon Communications. Retrieved 8 August 2017.
- Gara, Antoine (22 February 2016). "Verizon To Buy XO Communications' Fiber Business For $1.8B From Billionaire Carl Icahn". Forbes. Retrieved 8 August 2017.
- Moore, John (2017-03-13). "Unified Verizon-XO channel program set for June debut". SearchITChannel. Retrieved 2017-03-29.
|This article about a telecommunications corporation or company in the United States is a stub. You can help Wikipedia by expanding it.|