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XO Communications
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<p>XO Communications, LLC, previously Nextlink Communications, Concentric Network Corporation and Allegiance Telecom, Inc., was an American <a href="/facts/Telecommunications/vxoj1cxR">telecommunications</a> company. It was purchased and replaced by <a href="/facts/Verizon_Communications/8WkoRAUM">Verizon Communications</a>. </p>