13865 Sunrise Valley Dr, Herndon, VA, 20171 ()
phone: 703-547-2290 |http://www.xo.com
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About XO Communications
XO Communications is a leading nationwide provider of advanced IP communications, managed network and IT infrastructure services for business, large enterprise and wholesale customers. Our customers include more than half of the Fortune 500, in addition to leading cable, mobile wireless, and domestic and international telecommunications companies.