XO Communications

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.

Services
XO provided managed and converged Internet Protocol (IP) network services for small and medium-sized enterprises. XO delivered services through a mix of fiber-based Ethernet and Ethernet over Copper (EoC). In addition, the company had external network-to-network interface (E-NNI) agreements with traditional carriers and cable companies.

Acquisition
In a news release dated February 22, 2016, Verizon announced plans to acquire XO Communications' "fiber-optic network business." In 2017, Verizon completed its $1.8 billion acquisition of XO Communications. As of summer 2020 all XO services have been migrated to Verizon.