Core Viewpoint - Beijing's telecommunications infrastructure has completed the IPv6 transformation across its backbone, metropolitan, and access networks, indicating a significant advancement in digital infrastructure [1] Group 1: Infrastructure Development - All backbone, metropolitan, and access networks of Beijing's telecommunications companies have completed the IPv6 upgrade [1] - Newly constructed gigabit optical networks and 5G networks have fully implemented IPv6 deployment [1] - Major commercial websites in Beijing now support IPv6 access [1]