Level 3 Communications, Inc. was an American multinational telecommunications and Internet service provider company headquartered in Broomfield, Colorado.

On October 31, 2016, CenturyLink announced an agreement to acquire Level 3 Communications in a cash and stock transaction.

On April 11, 2011, Level 3 announced a tender offer had been made to acquire fellow Tier 1 provider Global Crossing[8] in an all-stock transaction,[9] which was approved by shareholders on August 5,[10] and completed on October 4, 2011.

[13] On June 16, 2014, Level 3 acquired TW Telecom, a business Internet connection provider, for about $5.7 billion.

[14] In July 2015, Level 3 acquired Black Lotus, a provider of protection against distributed denial of service (DDoS).

[31] In 2016, Level 3 Communications finished merging the former TW Telecom network (AS4323) into the former Global Crossing Network (AS3549) [32] Level 3 distributed and sold its services through a mix of six independent sales channels: large enterprise, wholesale, federal, content and media, midmarket, and indirect.

"[35] Apparently, as a result of this distribution agreement, Comcast sought to renegotiate the peering agreement with Level 3 and sought a recurring fee for carrying the increased Level 3 internet traffic to and from Comcast broadband customers.

"[39] On May 21, 2015, Level 3 and Comcast announced a new multi-year bilateral agreement to "enhance their existing network capacity while extending their mutual interconnection agreements, ensuring that both maintain ample capacity to exchange Internet traffic between their networks.

"[40][41] In July 2013, the NSA was accused of wiretapping large parts of data on the German Internet Exchange Point DE-CIX which was denied by Level 3,[42] and a few months later, was accused of tapping connections between Google and Yahoo data centers.