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 (Feb 2017)

  ISP IPv6 tests count
1.Cngi-cernet21,308
2.Hurricane Electric1,133
3.Zparknet973
4.CT Networks436
5.Cernet422
6.Cernet2-tsinghua6347
7.Xidian6-cernet241
8.Chinanet-sd208
9.Cernet2-tju6192
10.Hust6-cernet176
11.Cstnet-cnnic168
12.Zsu6-cernet153
13.Buaa6-cernet2130
14.Nankai6-cernet107
15.Pku6-cernet289
16.China Unicom82
17.Nwpu6-cernet80
18.Dlut6-cernet279
19.Whu6-cernet77
20.Chinanet-gd76
21.Chinanet-sh66
22.Sjtu6-cernet266
23.Buct6-cernet58
24.China Mobile communications corporation55
25.China Unicom Beijing Province Network49

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, Feb 2017)

  ISP Unique IPv6 addresses
1.Cngi-cernet2927
2.Hurricane Electric762
3.Zparknet268
4.CT Networks255
5.Cernet238
6.Cernet2-tsinghua6209
7.Cernet2-tju6130
8.Xidian6-cernet119
9.Cstnet-cnnic118
10.Hust6-cernet115
11.Buaa6-cernet2103
12.Zsu6-cernet94
13.Nankai6-cernet72
14.Chinanet-sd71
15.Pku6-cernet266
16.Nwpu6-cernet65
17.Chinanet-gd57
18.Dlut6-cernet252
19.China Unicom51
20.Whu6-cernet48
21.Chinanet-sh47
22.China Mobile communications corporation38
23.Neu6-cernet234
24.Zju6-cernet231
25.China Unicom Beijing Province Network30

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 (Feb 2017)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.Stu6-cernet1100.0%11100.0%
2.Uestc6-cernet2600.0%6100.0%
3.Zzu6-cernet500.0%5100.0%
4.Jlu6-cernet22000.0%20100.0%
5.Tongji6-cernet21200.0%12100.0%
6.Ihep800.0%8100.0%
7.Cau6-cernet1300.0%13100.0%
8.Nstuaf6-cernet500.0%5100.0%
9.Cernet2-hernet62015.0%1995.0%
10.Buct6-cernet5835.2%5594.8%
11.Apnic Portables81815.6%1794.4%
12.Szuc6-cernet4536.7%4293.3%
13.Cernet2-ruc61119.1%1090.9%
14.Xidian6-cernet2413414.1%20785.9%
15.Whu6-cernet771114.3%6685.7%
16.Buaa6-cernet21301914.6%11185.4%
17.Cstnet34514.7%2985.3%
18.Xmu6-cernet220315.0%1785.0%
19.Linode18316.7%1583.3%
20.Xjtu6-cernet48816.7%4083.3%
21.Nwu6-cernet6116.7%583.3%
22.Szu6-cernet41717.1%3482.9%
23.Scu6-cernet17317.6%1482.4%
24.Cumtb6-cernet16318.8%1381.3%
25.Nwpu6-cernet801518.8%6581.3%

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 (Feb 2017)

  ISP Test count IPv6 average
1.Cstnet-cnnic16831.0 Mbps
2.Cernet42224.2 Mbps
3.Nankai6-cernet10722.3 Mbps
4.Buct6-cernet5820.5 Mbps
5.Pku6-cernet28916.0 Mbps
6.Buaa6-cernet213015.4 Mbps
7.China Unicom Beijing Province Network4913.1 Mbps
8.Zsu6-cernet15310.6 Mbps
9.Ustc6-cernet2499.1 Mbps
10.Szu6-cernet417.8 Mbps
11.Cngi-cernet21,3087.4 Mbps
12.Cernet2-tju61927.3 Mbps
13.Whu6-cernet777.2 Mbps
14.Cernet2-tsinghua63477.0 Mbps
15.Tsinghua6-cernet2126.1 Mbps
16.Tyut6-cernet56.1 Mbps
17.Cau6-cernet136.0 Mbps
18.Jlu6-cernet2205.7 Mbps
19.Hunu6-cernet245.4 Mbps
20.Chinanet-sh665.2 Mbps
21.China Mobile communications corporation555.2 Mbps
22.Zju6-cernet2465.1 Mbps
23.Tongji6-cernet2124.8 Mbps
24.Xmu6-cernet2204.6 Mbps
25.Chinanet-js284.2 Mbps