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 (Aug 2023)

  ISP IPv6 tests count
1.Chinanet1,447
2.China Unicom Network1,238
3.China Mobile1,056
4.China Mobile communications corporation472
5.China Telecom196
6.Cloudflare, Inc.74
7.Cngi-cernet272
8.China Internet Network Information Center21
9.China Next Generation Internet CERNET218
10.Cernet15
11.Hangzhou Alibaba Advertising Co13
12.Beijing Baidu Netcom Science and Technology Co., Ltd.9
13.CERNET2 IX at Huazhong University of Science and Technology8
14.Tianjin University IPv6 Campus Network6
15.Shenzhen Tencent Computer Systems Company Limited6
16.China Science and Technology Network6
17.Computer Network Information Center5

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, Aug 2023)

  ISP Unique IPv6 addresses
1.Chinanet1,056
2.China Unicom Network912
3.China Mobile786
4.China Mobile communications corporation378
5.China Telecom142
6.Cloudflare, Inc.68
7.Cngi-cernet259
8.China Internet Network Information Center17
9.China Next Generation Internet CERNET216
10.Cernet12
11.Hangzhou Alibaba Advertising Co10
12.Beijing Baidu Netcom Science and Technology Co., Ltd.8
13.China Science and Technology Network6
14.Tianjin University IPv6 Campus Network4
15.Shenzhen Tencent Computer Systems Company Limited4
16.Computer Network Information Center4
17.CERNET2 IX at Huazhong University of Science and Technology2

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 (Aug 2023)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.CERNET2 IX at Huazhong University of Science and Technology8112.5%787.5%
2.Cloudflare, Inc.741317.6%6182.4%
3.Shenzhen Tencent Computer Systems Company Limited6233.3%466.7%
4.Beijing Baidu Netcom Science and Technology Co., Ltd.9444.4%555.6%
5.China Unicom Network1,23860849.1%63050.9%
6.China Next Generation Internet CERNET218950.0%950.0%
7.China Mobile communications corporation47223750.2%23549.8%
8.China Mobile1,05653350.5%52349.5%
9.China Telecom19610051.0%9649.0%
10.China Internet Network Information Center211152.4%1047.6%
11.Cngi-cernet2723852.8%3447.2%
12.Chinanet1,44777253.4%67546.6%
13.Cernet15960.0%640.0%
14.Computer Network Information Center5360.0%240.0%
15.China Science and Technology Network6466.7%233.3%
16.Hangzhou Alibaba Advertising Co13969.2%430.8%
17.Tianjin University IPv6 Campus Network6583.3%116.7%

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 (Aug 2023)

  ISP Test count IPv6 average
1.Tianjin University IPv6 Campus Network674.3 Mbps
2.China Mobile communications corporation47260.3 Mbps
3.China Unicom Network1,23826.6 Mbps
4.China Mobile1,05620.0 Mbps
5.Cernet159.1 Mbps
6.Chinanet1,4477.8 Mbps
7.China Telecom1960.6 Mbps
8.China Science and Technology Network60.3 Mbps
9.China Internet Network Information Center210.0 Mbps
10.Computer Network Information Center50.0 Mbps
11.Beijing Baidu Netcom Science and Technology Co., Ltd.90.0 Mbps
12.Cloudflare, Inc.740.0 Mbps
13.Shenzhen Tencent Computer Systems Company Limited60.0 Mbps
14.China Next Generation Internet CERNET2180.0 Mbps
15.Hangzhou Alibaba Advertising Co130.0 Mbps
16.Cngi-cernet2720.0 Mbps
17.CERNET2 IX at Huazhong University of Science and Technology80.0 Mbps
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