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 (Jan 2017)

  ISP IPv6 tests count
1.Cngi-cernet21,944
2.Hurricane Electric944
3.Zparknet882
4.Cernet592
5.CT Networks486
6.Cernet2-tsinghua6416
7.Xidian6-cernet301
8.Cernet2-tju6221
9.Hust6-cernet201
10.Buaa6-cernet2170
11.Cstnet-cnnic164
12.Zsu6-cernet164
13.Chinanet-sd159
14.Pku6-cernet2126
15.Sjtu6-cernet2124
16.Buct6-cernet103
17.Nwpu6-cernet94
18.Whu6-cernet92
19.Nankai6-cernet88
20.Dlut6-cernet285
21.Chinanet-gd77
22.China Unicom Beijing Province Network74
23.Zju6-cernet273
24.Szu6-cernet71
25.Neu6-cernet266

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, Jan 2017)

  ISP Unique IPv6 addresses
1.Cngi-cernet21,300
2.Hurricane Electric634
3.Cernet307
4.CT Networks301
5.Cernet2-tsinghua6265
6.Zparknet240
7.Cernet2-tju6148
8.Xidian6-cernet146
9.Hust6-cernet134
10.Buaa6-cernet2125
11.Cstnet-cnnic125
12.Zsu6-cernet105
13.Pku6-cernet299
14.Nwpu6-cernet70
15.Chinanet-gd64
16.Nankai6-cernet62
17.Dlut6-cernet256
18.Whu6-cernet53
19.Chinanet-sd52
20.China Mobile communications corporation52
21.China Unicom Beijing Province Network51
22.Sdu6-cernet249
23.Neu6-cernet248
24.Zju6-cernet245
25.Sjtu6-cernet240

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 (Jan 2017)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.Ihep700.0%7100.0%
2.Bjmu6-cernet500.0%5100.0%
3.Cau6-cernet700.0%7100.0%
4.Uestc6-cernet2700.0%7100.0%
5.Zzu6-cernet500.0%5100.0%
6.Stu6-cernet3313.0%3297.0%
7.Apnic Portables82913.4%2896.6%
8.Cernet2-hernet63625.6%3494.4%
9.Jlu6-cernet23026.7%2893.3%
10.Whu6-cernet9299.8%8390.2%
11.Szuc6-cernet45511.1%4088.9%
12.Dlut6-cernet2851011.8%7588.2%
13.Cumtb6-cernet40512.5%3587.5%
14.Buct6-cernet1031312.6%9087.4%
15.Ustc6-cernet239512.8%3487.2%
16.Szu6-cernet711014.1%6185.9%
17.Hrbeu6-cernet7114.3%685.7%
18.Xjtu6-cernet28414.3%2485.7%
19.Zzu6-cernet233515.2%2884.8%
20.Cernet2-ruc626415.4%2284.6%
21.Cstnet37616.2%3183.8%
22.Buaa6-cernet21703017.6%14082.4%
23.China Unicom561017.9%4682.1%
24.Cstnet-cnnic1643118.9%13381.1%
25.Xidian6-cernet3015819.3%24380.7%

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 (Jan 2017)

  ISP Test count IPv6 average
1.Cstnet-cnnic16442.8 Mbps
2.China Unicom Beijing Province Network7426.0 Mbps
3.Buct6-cernet10324.8 Mbps
4.Sjtu6-cernet212422.5 Mbps
5.Cernet59218.3 Mbps
6.Pku6-cernet212615.4 Mbps
7.Neu6-cernet26612.9 Mbps
8.Ustc6-cernet23911.0 Mbps
9.Whu6-cernet929.5 Mbps
10.Xmu6-cernet2179.3 Mbps
11.Szu6-cernet719.0 Mbps
12.Cstnet378.6 Mbps
13.Scu6-cernet158.1 Mbps
14.Zsu6-cernet1647.9 Mbps
15.China Mobile communications corporation647.7 Mbps
16.Cernet2-tsinghua64166.5 Mbps
17.Cau6-cernet76.0 Mbps
18.Cngi-cernet21,9446.0 Mbps
19.Zju6-cernet2735.8 Mbps
20.Jlu6-cernet2305.7 Mbps
21.Nankai6-cernet885.3 Mbps
22.Chinanet-sh575.2 Mbps
23.Tongji6-cernet2264.8 Mbps
24.Buaa6-cernet21704.8 Mbps
25.Cernet2-tju62214.3 Mbps