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 2017)

  ISP IPv6 tests count
1.Cngi-cernet22,640
2.Zparknet1,517
3.Hurricane Electric1,163
4.Cernet2-tsinghua6605
5.Cernet594
6.CT Networks402
7.Cstnet-cnnic365
8.Zsu6-cernet332
9.Chinanet-gd311
10.Buaa6-cernet2288
11.Cstnet276
12.Hust6-cernet253
13.Cernet2-tju6242
14.Xidian6-cernet238
15.Pku6-cernet2203
16.Szu6-cernet191
17.Dlut6-cernet2184
18.Whu6-cernet142
19.Cqu6-cernet2138
20.Xjtu6-cernet122
21.Neu6-cernet2101
22.China Unicom100
23.China Unicom Beijing Province Network94
24.China Mobile communications corporation84
25.Chinanet-sh81

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 2017)

  ISP Unique IPv6 addresses
1.Cngi-cernet21,810
2.Hurricane Electric755
3.Zparknet626
4.Cernet2-tsinghua6393
5.Cernet366
6.CT Networks265
7.Cstnet-cnnic243
8.Buaa6-cernet2222
9.Cstnet210
10.Chinanet-gd192
11.Cernet2-tju6187
12.Zsu6-cernet183
13.Pku6-cernet2163
14.Xidian6-cernet153
15.Hust6-cernet132
16.Szu6-cernet102
17.Dlut6-cernet294
18.Whu6-cernet84
19.Cqu6-cernet281
20.China Unicom Beijing Province Network72
21.China Unicom72
22.Nwpu6-cernet55
23.China Mobile communications corporation53
24.Neu6-cernet249
25.Zju6-cernet247

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 (Sep 2017)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.Opera1000.0%10100.0%
2.Jmu6-cernet500.0%5100.0%
3.Xtom-hkg1400.0%14100.0%
4.Zzu6-cernet700.0%7100.0%
5.Rixcloudchina1500.0%15100.0%
6.Imlonghao1000.0%10100.0%
7.Szuc6-cernet5747.0%5393.0%
8.Szu6-cernet191147.3%17792.7%
9.Sjtu6-cernet28067.5%7492.5%
10.Jlu6-cernet25048.0%4692.0%
11.Xjtu6-cernet122108.2%11291.8%
12.Ahu6-cernet2428.3%2291.7%
13.Cernet2-sjtu61218.3%1191.7%
14.Hrbeu6-cernet3538.6%3291.4%
15.Bjmu6-cernet10110.0%990.0%
16.Jamesits10110.0%990.0%
17.Xmu6-cernet219210.5%1789.5%
18.Cer2bkb6-cernet273811.0%6589.0%
19.China Unicom1001111.0%8989.0%
20.Csu6-cernet9111.1%888.9%
21.Cumtb6-cernet27311.1%2488.9%
22.CTM Internet Service35411.4%3188.6%
23.Whu6-cernet1421812.7%12487.3%
24.Scu6-cernet47612.8%4187.2%
25.Ihep46613.0%4087.0%

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 (Sep 2017)

  ISP Test count IPv6 average
1.Buaa6-cernet228871.2 Mbps
2.Rixcloudchina1532.0 Mbps
3.IT7 Networks Inc628.4 Mbps
4.Buct6-cernet7827.8 Mbps
5.Pku6-cernet220326.0 Mbps
6.Jlu6-cernet25026.0 Mbps
7.Tsinghua6-cernet2924.8 Mbps
8.China Unicom10024.7 Mbps
9.Cstnet27623.7 Mbps
10.CNC Group CHINA169 Tianjin Province Network1822.7 Mbps
11.Cer2bkb6-cernet27321.6 Mbps
12.Cumtb6-cernet2721.3 Mbps
13.Hust6-cernet25320.7 Mbps
14.Fudan6-cernet22620.2 Mbps
15.Cqu6-cernet213819.3 Mbps
16.Cau6-cernet2117.2 Mbps
17.Hrbeu6-cernet3517.0 Mbps
18.Cernet2-tju624216.9 Mbps
19.China Unicom Tianjin Province Network4316.8 Mbps
20.China Mobile communications corporation8415.4 Mbps
21.Szu6-cernet19115.4 Mbps
22.Hunu6-cernet1715.3 Mbps
23.Hurricane Electric1,16315.1 Mbps
24.Cernet2-tsinghua660515.1 Mbps
25.Cstnet-cnnic36515.0 Mbps