Level 3 Communications is an international communications and information services company. The company operates one of the largest communications and Internet backbones in the world. The company is also one of the largest providers of wholesale dial-up service to Internet service providers in North America and is the primary provider of Internet connectivity for millions of broadband subscribers through its cable and digital subscriber line partners. Level 3 offers a wide range of communications services throughout its approximately 23,000-mile broadband fiber optic network, which includes Internet protocol services, broadband transport, collocation services, and managed modem and voice services. It trades on NASDAQ. Level 3 Communications is headquartered in Broomfield, Colo.