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 (Dec 2016)

  ISP IPv6 tests count
1.Cngi-cernet22,520
2.Hurricane Electric1,065
3.Cernet823
4.Zparknet748
5.CT Networks509
6.Cernet2-tsinghua6442
7.Hust6-cernet335
8.Zsu6-cernet335
9.Xidian6-cernet318
10.Cernet2-tju6261
11.Buaa6-cernet2231
12.Pku6-cernet2209
13.Cstnet-cnnic199
14.Chinanet-gd166
15.Buct6-cernet144
16.Dlut6-cernet2123
17.Sjtu6-cernet2122
18.Szu6-cernet100
19.Neu6-cernet296
20.Zju6-cernet292
21.China Unicom Beijing Province Network90
22.Nankai6-cernet90
23.Sdu6-cernet287
24.Whu6-cernet85
25.China Mobile communications corporation77

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, Dec 2016)

  ISP Unique IPv6 addresses
1.Cngi-cernet21,687
2.Hurricane Electric663
3.Cernet403
4.CT Networks311
5.Cernet2-tsinghua6302
6.Zparknet210
7.Hust6-cernet202
8.Zsu6-cernet186
9.Cernet2-tju6185
10.Xidian6-cernet179
11.Buaa6-cernet2159
12.Pku6-cernet2145
13.Cstnet-cnnic143
14.Chinanet-gd102
15.Dlut6-cernet282
16.Neu6-cernet271
17.China Unicom Beijing Province Network67
18.Sdu6-cernet266
19.Nankai6-cernet65
20.Zju6-cernet264
21.China Mobile communications corporation56
22.Whu6-cernet48
23.Szu6-cernet47
24.Cumtb6-cernet45
25.Chinanet-hb42

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 (Dec 2016)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.Bjmu6-cernet800.0%8100.0%
2.Ihep1000.0%10100.0%
3.Ningbo-shengdong-ltd600.0%6100.0%
4.Uestc6-cernet2800.0%8100.0%
5.Stu6-cernet3313.0%3297.0%
6.Hrbeu6-cernet2015.0%1995.0%
7.Cernet2-hernet63226.3%3093.8%
8.Jlu6-cernet22827.1%2692.9%
9.Cau6-cernet1317.7%1292.3%
10.Cumtb6-cernet5758.8%5291.2%
11.Szu6-cernet1001111.0%8989.0%
12.Nwu6-cernet17211.8%1588.2%
13.Buct6-cernet1441913.2%12586.8%
14.Szuc6-cernet59813.6%5186.4%
15.China Unicom62914.5%5385.5%
16.Swufe6-cernet19315.8%1684.2%
17.Xjtu6-cernet31516.1%2683.9%
18.Whu6-cernet851416.5%7183.5%
19.Cstnet40717.5%3382.5%
20.Cernet2-tsinghua64428018.1%36281.9%
21.Xidian6-cernet3185818.2%26081.8%
22.Cstnet-cnnic1993819.1%16180.9%
23.Buaa6-cernet22314619.9%18580.1%
24.Cer2bkb6-cernet25120.0%480.0%
25.Cernet2-ruc635720.0%2880.0%

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 (Dec 2016)

  ISP Test count IPv6 average
1.Cernet2-ruc63555.8 Mbps
2.Cstnet-cnnic19938.2 Mbps
3.Buct6-cernet14418.0 Mbps
4.Uestc6-cernet2815.1 Mbps
5.Sjtu6-cernet212212.2 Mbps
6.Nankai6-cernet9011.4 Mbps
7.Pku6-cernet220911.1 Mbps
8.Hrbeu6-cernet2010.9 Mbps
9.Xmu6-cernet22710.7 Mbps
10.Neu6-cernet29610.4 Mbps
11.Cernet82310.3 Mbps
12.Cernet2-tju62619.3 Mbps
13.Szu6-cernet1009.0 Mbps
14.Cngi-cernet22,5208.0 Mbps
15.Zsu6-cernet3357.8 Mbps
16.Nwpu6-cernet647.1 Mbps
17.Dlut6-cernet21237.1 Mbps
18.Cau6-cernet136.0 Mbps
19.China Mobile communications corporation775.9 Mbps
20.Cernet2-tsinghua64425.8 Mbps
21.Hust6-cernet3355.7 Mbps
22.Cstnet405.1 Mbps
23.Hurricane Electric1,0655.0 Mbps
24.Tongji6-cernet2524.6 Mbps
25.Cernet2-sjtu6214.6 Mbps