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 (Nov 2017)

  ISP IPv6 tests count
1.Cngi-cernet24,590
2.Hurricane Electric1,939
3.Zparknet1,433
4.Cernet1,110
5.Cstnet-cnnic868
6.Cernet2-tsinghua6854
7.Buaa6-cernet2559
8.Pku6-cernet2551
9.Zsu6-cernet520
10.Hust6-cernet492
11.Cstnet445
12.CT Networks385
13.Chinanet-gd361
14.Xidian6-cernet318
15.Cernet2-tju6304
16.China Mobile communications corporation273
17.Dlut6-cernet2262
18.China Unicom Beijing Province Network251
19.Szu6-cernet224
20.Xjtu6-cernet195
21.Whu6-cernet154
22.Chinanet-sh146
23.Cernet2-ruc6137
24.Neu6-cernet2132
25.Zzu6-cernet2130

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, Nov 2017)

  ISP Unique IPv6 addresses
1.Cngi-cernet22,940
2.Hurricane Electric1,207
3.Cernet697
4.Cstnet-cnnic629
5.Cernet2-tsinghua6566
6.Zparknet538
7.Pku6-cernet2451
8.Buaa6-cernet2381
9.Cstnet338
10.Zsu6-cernet308
11.CT Networks281
12.Chinanet-gd271
13.Hust6-cernet248
14.Cernet2-tju6229
15.Xidian6-cernet211
16.China Mobile communications corporation184
17.Dlut6-cernet2172
18.China Unicom Beijing Province Network168
19.Szu6-cernet129
20.Whu6-cernet104
21.Cernet2-ruc699
22.Zju6-cernet291
23.Nwpu6-cernet91
24.Chinanet-sh90
25.Neu6-cernet284

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 (Nov 2017)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.Xtom700.0%7100.0%
2.Tigv6900.0%9100.0%
3.Ihep800.0%8100.0%
4.Nato Research Ltd.1100.0%11100.0%
5.Opera1000.0%10100.0%
6.Cumtb6-cernet3912.6%3897.4%
7.Stu6-cernet6023.3%5896.7%
8.NetAssist2314.3%2295.7%
9.Xjtu6-cernet195126.2%18393.8%
10.Uestc6-cernet23126.5%2993.5%
11.Ahu6-cernet3738.1%3491.9%
12.Imlonghao1119.1%1090.9%
13.Szuc6-cernet8689.3%7890.7%
14.Csu6-cernet10110.0%990.0%
15.China Unicom1231411.4%10988.6%
16.Hrbeu6-cernet35411.4%3188.6%
17.Sjtu6-cernet21171412.0%10388.0%
18.Fudan6-cernet258712.1%5187.9%
19.Zzu6-cernet16212.5%1487.5%
20.Sdu6-cernet2781012.8%6887.2%
21.Xidian6-cernet3184112.9%27787.1%
22.Jlu6-cernet21201613.3%10486.7%
23.Cernet2-sjtu630413.3%2686.7%
24.Pku6-cernet25517413.4%47786.6%
25.Cstnet4456013.5%38586.5%

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 (Nov 2017)

  ISP Test count IPv6 average
1.Cernet2-tsinghua685439.8 Mbps
2.Scu6-cernet4634.0 Mbps
3.Buaa6-cernet255932.4 Mbps
4.Jiangsu Network of ChinaTelecom3229.2 Mbps
5.Tsinghua6-cernet2726.0 Mbps
6.Pku6-cernet255125.0 Mbps
7.Chinanet-sc7624.3 Mbps
8.Cstnet44524.0 Mbps
9.Cernet1,11023.2 Mbps
10.Jlu6-cernet212022.3 Mbps
11.Bjmu6-cernet3021.5 Mbps
12.CNC Group CHINA169 Henan Province Network12221.4 Mbps
13.CNC Group CHINA169 Tianjin Province Network3519.5 Mbps
14.Cernet2-tju630419.3 Mbps
15.Whu6-cernet15416.7 Mbps
16.China Unicom Henan Province Network2616.6 Mbps
17.China Unicom Tianjin Province Network6016.5 Mbps
18.Chinanet-ah4216.3 Mbps
19.Hunu6-cernet4116.2 Mbps
20.Hrbeu6-cernet3515.3 Mbps
21.Dlut6-cernet226215.2 Mbps
22.Neu6-cernet213215.2 Mbps
23.Fudan6-cernet25813.9 Mbps
24.Zsu6-cernet52013.7 Mbps
25.China Unicom12313.5 Mbps