Level 3 Communications NASDAQ: LVLT is a communications an information services company headquartered in Broomfield, Colorado, USA. It has operating locations throughout the US and Europe. The company operates one of the largest communications and Internet backbones in the world. Level 3 is a Tier 1 network and the current owner of AS1, but it operationally uses AS3356, which as of 2007 consistently has one of the highest ranked connectivity degrees on the Internet.