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 2018)

  ISP IPv6 tests count
1.Cngi-cernet23,966
2.Zparknet1,342
3.Hurricane Electric1,329
4.Zsu6-cernet1,109
5.Cernet889
6.Cernet2-tsinghua6818
7.CT Networks747
8.Pku6-cernet2656
9.Buaa6-cernet2455
10.Hust6-cernet438
11.Cernet2-tju6395
12.China Unicom317
13.Dlut6-cernet2305
14.Cstnet295
15.Zzu6-cernet2293
16.Cstnet-cnnic276
17.Lzu6-cernet2269
18.Chinanet-gd261
19.China Mobile communications corporation261
20.Nankai6-cernet229
21.Xidian6-cernet178
22.Szu6-cernet164
23.China Unicom Beijing Province Network158
24.Chinanet-sh154
25.Cer2bkb6-cernet2123

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 2018)

  ISP Unique IPv6 addresses
1.Cngi-cernet22,698
2.Hurricane Electric873
3.Zsu6-cernet771
4.Cernet613
5.Cernet2-tsinghua6530
6.CT Networks505
7.Zparknet498
8.Pku6-cernet2478
9.Buaa6-cernet2295
10.Cernet2-tju6279
11.Zzu6-cernet2221
12.Cstnet-cnnic219
13.Dlut6-cernet2203
14.China Unicom197
15.Hust6-cernet196
16.China Mobile communications corporation194
17.Cstnet194
18.Chinanet-gd189
19.Lzu6-cernet2168
20.Nankai6-cernet158
21.Xidian6-cernet121
22.China Unicom Beijing Province Network114
23.Szu6-cernet111
24.Chinanet-sh93
25.Chinanet-js77

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 2018)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.University of Tsukuba, Sangaku Renkei Kenkyukai600.0%6100.0%
2.Bupt6-cernet2500.0%5100.0%
3.SnapServ Ltd1100.0%11100.0%
4.Tyut6-cernet700.0%7100.0%
5.Chd6-cernet800.0%8100.0%
6.American Registry Internet Numbers1800.0%18100.0%
7.China Next Generation Internet CERNET21000.0%10100.0%
8.Jmu6-cernet2214.5%2195.5%
9.NetAssist7456.8%6993.2%
10.Zzgiant1218.3%1191.7%
11.Nstuaf6-cernet2129.5%1990.5%
12.Ihep10110.0%990.0%
13.Hrbeu6-cernet1041110.6%9389.4%
14.Wasuhz15213.3%1386.7%
15.Buct6-cernet37513.5%3286.5%
16.Cstnet2954113.9%25486.1%
17.Ahu6-cernet50714.0%4386.0%
18.Neu6-cernet2871314.9%7485.1%
19.Xjtu6-cernet991515.2%8484.8%
20.CERNET New Technology Co.45715.6%3884.4%
21.Tsinghua6-cernet245715.6%3884.4%
22.Xmu6-cernet224416.7%2083.3%
23.Pku6-cernet265611417.4%54282.6%
24.Uestc6-cernet230620.0%2480.0%
25.Cernet2-tsinghua681816520.2%65379.8%

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 2018)

  ISP Test count IPv6 average
1.China Mobile communications corporation261237.8 Mbps
2.NetAssist7454.5 Mbps
3.Hurricane Electric1,32938.5 Mbps
4.China Unicom Tianjin Province Network6927.9 Mbps
5.China Unicom31727.5 Mbps
6.Buaa6-cernet245526.4 Mbps
7.Choopa924.1 Mbps
8.China Unicom Henan Province Network2320.3 Mbps
9.CNC Group CHINA169 Tianjin Province Network6619.6 Mbps
10.China Unicom CHINA169 Jiangsu Province Network3216.5 Mbps
11.CNC Group CHINA169 Chongqing Province Network615.5 Mbps
12.CNC Group CHINA169 Zhejiang Province Network514.9 Mbps
13.Tsinghua6-cernet24513.5 Mbps
14.CNC Group CHINA169 Henan Province Network6711.7 Mbps
15.CNC Group CHINA169 Shandong Province Network809.7 Mbps
16.Chinanet-ah279.4 Mbps
17.China Unicom Chongqing Province Network68.7 Mbps
18.Fengniao167.8 Mbps
19.Ihep107.8 Mbps
20.Hust6-cernet4387.4 Mbps
21.Chinanet-gd2616.3 Mbps
22.Chinanet-sh1545.0 Mbps
23.Pku6-cernet26565.0 Mbps
24.Chinanet-hn204.9 Mbps
25.Cau6-cernet484.3 Mbps