China IPv6 in China

These graphs show the evolution of default protocol, v6 address types, and average bandwidth in China over time.

They are generated using the data collected by the ipv6-test.com connection test page, and are updated on a monthly basis.

Overall IPv6 and v4 protocol support in China

This graph shows the evolution of IPv6 support vs IPv4 for all our connection test.

The numbers are percentages, so we can expect almost 100% of hosts supporting IPv4 with a slow growth for IPv6.

Top 25 internet service providers for IPv6 in China (Feb 2020)

  ISP IPv6 tests count
1.Chinanet4,849
2.China Mobile communications corporation2,885
3.China Unicom Network2,741
4.China Mobile2,671
5.China Next Generation Internet CERNET2181
6.Hurricane Electric LLC93
7.Cernet44
8.Cngi-cernet238
9.Cstnet31
10.CTM Internet Service29
11.Cernet2-tsinghua620
12.Google LLC17
13.DMIT Inc11

IPv6 and v4 protocol support in China (unique addresses)

This graph shows the evolution of IPv6 support vs IPv4 for unique users of our connection test.

The numbers are percentages, so we can expect a slow growth towards 50% v4 / 50% v6.

Top 25 internet service providers for IPv6 in China (unique addresses, Feb 2020)

  ISP Unique IPv6 addresses
1.Chinanet3,081
2.China Unicom Network1,896
3.China Mobile communications corporation1,771
4.China Mobile1,729
5.China Next Generation Internet CERNET2106
6.Hurricane Electric LLC63
7.Cngi-cernet226
8.CTM Internet Service23
9.Cernet22
10.Cstnet20
11.Cernet2-tsinghua613
12.DMIT Inc8
13.Google LLC8

Default browser protocol in China

This graph shows the percentage of browsers that default to IPv6 vs. IPv4 when visiting the ipv6-test connection test.

Hopefully, in the not so distant future, the v6 part will grow taller than the v4 one.

Default browser protocol in China (dual-stack users)

This graph shows the percentage of browsers that default to IPv6 vs. IPv4 for users that have both v4 and v6 connectivity.

Usually a system will default to v6 when it's available, but in some cases with tunneled connections, v4 stays the default.

Top 25 internet service providers for IPv6 default in China (Feb 2020)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.Cstnet3139.7%2890.3%
2.Cernet44511.4%3988.6%
3.Hurricane Electric LLC931212.9%8187.1%
4.Cngi-cernet238615.8%3284.2%
5.CTM Internet Service29827.6%2172.4%
6.China Unicom Network2,74183230.4%1,90969.6%
7.China Mobile communications corporation2,88589931.2%1,98668.8%
8.China Mobile2,67187532.8%1,79667.2%
9.China Next Generation Internet CERNET21817440.9%10759.1%
10.Chinanet4,8492,30547.5%2,54452.5%
11.DMIT Inc11654.5%545.5%
12.Cernet2-tsinghua6201890.0%210.0%
13.Google LLC1717100.0%00.0%

IPv6 address types in China

Here you can see the evolution of address types over time, and measure usage of 6to4 and Teredo tunneled connectivity.

It should be noted that because 6rd works with native addresses, it cannot be detected here as tunneled. This is also the case with VPN based tunnels.

Downstream bandwidth in China

This graph illustrates the connection speed gap between IPv4 and IPv6, numbers represent v6 speed as percentage of v4 speed.

The lower IPv6 speeds are often caused by tunneling overhead or insufficient v6 connectivity or peering capacity at ISPs.

Top 25 internet service providers for IPv6 speed in China (Feb 2020)

  ISP Test count IPv6 average
1.Cngi-cernet23823.1 Mbps
2.Cernet4421.7 Mbps
3.Cstnet3112.5 Mbps
4.China Next Generation Internet CERNET21819.7 Mbps
5.China Unicom Network2,7418.2 Mbps
6.China Mobile communications corporation2,8853.0 Mbps
7.China Mobile2,6712.5 Mbps
8.Chinanet4,8490.1 Mbps
9.Hurricane Electric LLC930.0 Mbps
10.DMIT Inc110.0 Mbps
11.CTM Internet Service290.0 Mbps
12.Cernet2-tsinghua6200.0 Mbps
13.Google LLC170.0 Mbps