XO Communications
| XO | |
| Company type | Subsidiary |
| Industry | Telecommunications |
| Predecessors |
|
| Founded | July 4, 1996 in Bellevue, Washington |
| Fate | Replaced by Verizon |
| Successor | Verizon Communications |
| Headquarters | , |
Areas served | Primarily the United States, South America, Europe, Middle East, Asia and Oceania |
Key people | |
| Products | VoIP services, Network Services, Hosted Services, Carrier / Wholesale |
| Website | www |
XO Communications, LLC, previously Nextlink Communications, Concentric Network Corporation and Allegiance Telecom, Inc., was an American telecommunications company. It was purchased and replaced by Verizon Communications.