Why IPv6 Matters: Benefits, Deployment Plans, and How It Works

IPv6 Deployment Initiative

The Central Committee of the Communist Party and the State Council issued a plan to accelerate large‑scale deployment of IPv6, aiming for 200 million active users by the end of 2018, 500 million by 2020, and to become the world leader by 2025.

The National Engineering Center for the Next‑Generation Internet launched the “Snowman Plan,” installing 25 IPv6 root servers worldwide, including four in China, and introduced a public DNS service (240c::6666) to provide fast, stable, and secure resolution for IPv6 users.

Why IPv6 Is Needed

IPv4 uses 32‑bit addresses, offering about 4.3 billion addresses, which are nearly exhausted. Developed countries like the United States have many addresses per user, while developing nations have far fewer.

With the growth of the Internet of Things, industrial Internet, and other applications, demand for IP addresses will continue to rise, potentially exceeding 100 billion in China alone.

What Is IPv6?

IPv6 expands the address length to 128 bits, providing 2¹²⁸ possible addresses. It uses hexadecimal notation and offers three representation methods:

Standard colon‑separated hexadecimal format (X:X:X:X:X:X:X:X), where leading zeros can be omitted.

Zero‑compression using "::" to replace a consecutive block of zeros (allowed only once per address).

Embedded IPv4 format (X:X:X:X:X:X:d.d.d.d) for IPv4‑IPv6 interoperability.

Advantages of IPv6 Over IPv4

Larger address space : 2¹²⁸‑1 addresses versus 2³²‑1 in IPv4.

Smaller routing tables : Aggregation reduces the number of entries, speeding up routing.

Improved multicast and flow control , supporting multimedia QoS.

Auto‑configuration enhancements over DHCP, simplifying network management.

Higher security : Built‑in IPsec for encryption and authentication.

Identity verification and confidentiality features integrated into the protocol.

These benefits enable IPv6 to support emerging technologies such as 5G, IoT, cloud computing, big data, and artificial intelligence.