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 (Sep 2023)

  ISP IPv6 tests count
1.Chinanet1,582
2.China Unicom Network1,118
3.China Mobile914
4.China Mobile communications corporation456
5.China Telecom274
6.Cngi-cernet2125
7.Computer Network Information Center93
8.China Next Generation Internet CERNET271
9.Cloudflare, Inc.69
10.Cernet37
11.China Internet Network Information Center25
12.Tsinghua University12
13.DigitalOcean, LLC12
14.China Science and Technology Network11
15.Shenzhen Tencent Computer Systems Company Limited10
16.CERNET2 IX at Huazhong University of Science and Technology9
17.Hangzhou Alibaba Advertising Co6
18.CERNET2 IX at Shanghai Jiaotong University5

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, Sep 2023)

  ISP Unique IPv6 addresses
1.Chinanet1,147
2.China Unicom Network838
3.China Mobile731
4.China Mobile communications corporation349
5.China Telecom197
6.Cngi-cernet2107
7.Computer Network Information Center71
8.Cloudflare, Inc.66
9.China Next Generation Internet CERNET253
10.Cernet31
11.China Internet Network Information Center18
12.China Science and Technology Network11
13.Tsinghua University10
14.Shenzhen Tencent Computer Systems Company Limited8
15.CERNET2 IX at Huazhong University of Science and Technology6
16.Hangzhou Alibaba Advertising Co5
17.CERNET2 IX at Shanghai Jiaotong University4
18.DigitalOcean, LLC2

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.

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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 (Sep 2023)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.DigitalOcean, LLC12216.7%1083.3%
2.Cloudflare, Inc.692130.4%4869.6%
3.China Internet Network Information Center25936.0%1664.0%
4.CERNET2 IX at Shanghai Jiaotong University5240.0%360.0%
5.Shenzhen Tencent Computer Systems Company Limited10440.0%660.0%
6.China Mobile91437641.1%53858.9%
7.China Mobile communications corporation45619141.9%26558.1%
8.Computer Network Information Center934043.0%5357.0%
9.CERNET2 IX at Huazhong University of Science and Technology9444.4%555.6%
10.China Unicom Network1,11850345.0%61555.0%
11.China Telecom27412746.4%14753.6%
12.Chinanet1,58277749.1%80550.9%
13.Cngi-cernet21256753.6%5846.4%
14.Cernet372054.1%1745.9%
15.China Next Generation Internet CERNET2714157.7%3042.3%
16.Hangzhou Alibaba Advertising Co6466.7%233.3%
17.China Science and Technology Network11872.7%327.3%
18.Tsinghua University121083.3%216.7%

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 (Sep 2023)

  ISP Test count IPv6 average
1.Cloudflare, Inc.6995.1 Mbps
2.China Mobile communications corporation45640.8 Mbps
3.China Telecom27431.6 Mbps
4.Cngi-cernet212528.3 Mbps
5.China Unicom Network1,11823.1 Mbps
6.China Mobile91413.7 Mbps
7.China Next Generation Internet CERNET27110.7 Mbps
8.Chinanet1,5829.7 Mbps
9.Computer Network Information Center930.5 Mbps
10.China Science and Technology Network110.3 Mbps
11.Cernet370.1 Mbps
12.China Internet Network Information Center250.0 Mbps
13.Tsinghua University120.0 Mbps
14.CERNET2 IX at Huazhong University of Science and Technology90.0 Mbps
15.Hangzhou Alibaba Advertising Co60.0 Mbps
16.Shenzhen Tencent Computer Systems Company Limited100.0 Mbps
17.CERNET2 IX at Shanghai Jiaotong University50.0 Mbps
18.DigitalOcean, LLC120.0 Mbps
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