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 (Apr 2019)

  ISP IPv6 tests count
1.CT Networks2,272
2.China Unicom Network1,669
3.China Mobile1,652
4.China Next Generation Internet CERNET21,148
5.Chinanet879
6.Cngi-cernet2761
7.Zparknet576
8.China Mobile communications corporation380
9.Cernet224
10.Cernet2-tsinghua6154
11.Hurricane Electric LLC114
12.No.31, Jin-rong Street66
13.CERNET2 IX at Tianjin University56
14.Cstnet56
15.Cstnet-cnnic39
16.DMIT Inc24
17.ZhengZhou GIANT Computer Network Technology Co., Ltd12
18.CERNET2 IX at Peking University12
19.Jiangsu Network of ChinaTelecom11
20.Hurricane Electric10
21.Wowrack.com9
22.China Unicom Beijing Province Network9
23.China Unicom Henan Province Network8
24.Hosteons Pte. Ltd8
25.Heyixinxi8

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, Apr 2019)

  ISP Unique IPv6 addresses
1.CT Networks1,155
2.China Unicom Network1,133
3.China Mobile1,131
4.China Next Generation Internet CERNET2753
5.Chinanet573
6.Cngi-cernet2555
7.China Mobile communications corporation250
8.Zparknet226
9.Cernet158
10.Hurricane Electric LLC90
11.Cernet2-tsinghua688
12.Cstnet46
13.No.31, Jin-rong Street45
14.CERNET2 IX at Tianjin University42
15.Cstnet-cnnic34
16.DMIT Inc9
17.Hurricane Electric9
18.CERNET2 IX at Peking University8
19.ZhengZhou GIANT Computer Network Technology Co., Ltd7
20.China Unicom Beijing Province Network7
21.Wowrack.com5
22.China Telecom (Group)4
23.Founderbn4
24.Dmitinc4
25.Heyixinxi4

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 (Apr 2019)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.Hosteons Pte. Ltd800.0%8100.0%
2.CERNET2 IX at Tsinghua University700.0%7100.0%
3.Founderbn6116.7%583.3%
4.CERNET2 IX at Peking University12216.7%1083.3%
5.Cstnet561119.6%4580.4%
6.Dmitinc5120.0%480.0%
7.Cernet2244520.1%17979.9%
8.Hurricane Electric LLC1142521.9%8978.1%
9.Wowrack.com9222.2%777.8%
10.China Mobile communications corporation3808622.6%29477.4%
11.China Next Generation Internet CERNET21,14826523.1%88376.9%
12.CERNET2 IX at Tianjin University561323.2%4376.8%
13.China Mobile1,65240024.2%1,25275.8%
14.ZhengZhou GIANT Computer Network Technology Co., Ltd12325.0%975.0%
15.Cngi-cernet276122429.4%53770.6%
16.Cstnet-cnnic391230.8%2769.2%
17.Ihep6233.3%466.7%
18.Cernet2-tsinghua61545233.8%10266.2%
19.China Unicom Network1,66957634.5%1,09365.5%
20.CERNET2 IX at Shanghai Jiaotong University5240.0%360.0%
21.Chinanet87936341.3%51658.7%
22.CT Networks2,27299043.6%1,28256.4%
23.Hurricane Electric10550.0%550.0%
24.Zparknet57631654.9%26045.1%
25.Heyixinxi8562.5%337.5%

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 (Apr 2019)

  ISP Test count IPv6 average
1.Ihep647.6 Mbps
2.China Unicom Beijing Province Network914.5 Mbps
3.DMIT Inc2410.6 Mbps
4.CT Networks2,2727.2 Mbps
5.Chinanet8796.1 Mbps
6.China Unicom Network1,6694.1 Mbps
7.Wowrack.com94.0 Mbps
8.China Mobile1,6522.5 Mbps
9.China Mobile communications corporation3802.0 Mbps
10.Cstnet561.1 Mbps
11.Cngi-cernet27610.3 Mbps
12.No.31, Jin-rong Street660.1 Mbps
13.Jiangsu Network of ChinaTelecom110.1 Mbps
14.China Next Generation Internet CERNET21,1480.1 Mbps
15.Cernet2240.1 Mbps
16.Founderbn60.1 Mbps
17.Cstnet-cnnic390.1 Mbps
18.CERNET2 IX at Tianjin University560.1 Mbps
19.Cernet2-tsinghua61540.1 Mbps
20.Zparknet5760.1 Mbps
21.China Telecom (Group)60.1 Mbps
22.CERNET2 IX at Peking University120.1 Mbps
23.China Unicom Henan Province Network80.0 Mbps
24.Dmitinc50.0 Mbps
25.CERNET2 IX at Tsinghua University70.0 Mbps