Lumen

Autonomous System 3356 is one of the world's largest Tier-1 IP backbones, operated by Lumen Technologies and assembled from the merger of CenturyLink and Level 3 Communications. It carries internet transit, content delivery, and cloud connectivity over a global fiber network that traces back to Level 3's pioneering backbone. Registered in the United States, AS3356 remains one of the most connected networks by peering and a frequent upstream for enterprises and smaller providers. Its long history makes it a fixture in global routing tables. Serving as an upstream for many downstream networks, a matching address often represents a backbone link rather than a subscriber.