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 2020)

  ISP IPv6 tests count
1.Chinanet3,215
2.China Unicom Network2,649
3.China Next Generation Internet CERNET21,015
4.China Mobile838
5.China Mobile communications corporation631
6.Cngi-cernet2590
7.Cstnet353
8.Cernet153
9.Hurricane Electric LLC104
10.Cernet2-tsinghua674
11.CERNET2 IX at Tianjin University44
12.CTM Internet Service26
13.CERNET2 IX at Shanghai Jiaotong University24
14.Scuu9
15.DMIT Inc9
16.Alisoft6
17.China Education and Research Network6
18.Tencent6
19.Ihep6

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 2020)

  ISP Unique IPv6 addresses
1.Chinanet2,225
2.China Unicom Network2,085
3.China Mobile659
4.China Next Generation Internet CERNET2623
5.China Mobile communications corporation476
6.Cngi-cernet2431
7.Cstnet248
8.Cernet120
9.Cernet2-tsinghua651
10.Hurricane Electric LLC43
11.CERNET2 IX at Tianjin University36
12.CTM Internet Service20
13.CERNET2 IX at Shanghai Jiaotong University10
14.China Education and Research Network4
15.Ihep4
16.Alisoft3
17.DMIT Inc3
18.Scuu2
19.Tencent1

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 2020)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.Alisoft600.0%6100.0%
2.Ihep600.0%6100.0%
3.Tencent600.0%6100.0%
4.CTM Internet Service2613.8%2596.2%
5.Cstnet3535114.4%30285.6%
6.Hurricane Electric LLC1041615.4%8884.6%
7.China Education and Research Network6116.7%583.3%
8.China Mobile83817320.6%66579.4%
9.CERNET2 IX at Shanghai Jiaotong University24520.8%1979.2%
10.Cernet1533724.2%11675.8%
11.Cernet2-tsinghua6741824.3%5675.7%
12.China Next Generation Internet CERNET21,01527226.8%74373.2%
13.Cngi-cernet259017229.2%41870.8%
14.China Unicom Network2,64982631.2%1,82368.8%
15.China Mobile communications corporation63120031.7%43168.3%
16.CERNET2 IX at Tianjin University441840.9%2659.1%
17.Chinanet3,2151,56248.6%1,65351.4%
18.Scuu9666.7%333.3%
19.DMIT Inc9777.8%222.2%

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 2020)

  ISP Test count IPv6 average
1.DMIT Inc9119.5 Mbps
2.Ihep637.6 Mbps
3.Hurricane Electric LLC10428.4 Mbps
4.Cstnet35323.7 Mbps
5.China Mobile communications corporation6318.2 Mbps
6.China Mobile8387.7 Mbps
7.CERNET2 IX at Tianjin University446.4 Mbps
8.Cernet1534.9 Mbps
9.China Next Generation Internet CERNET21,0154.8 Mbps
10.Cngi-cernet25904.5 Mbps
11.Cernet2-tsinghua6742.9 Mbps
12.China Unicom Network2,6490.4 Mbps
13.Chinanet3,2150.1 Mbps
14.China Education and Research Network60.0 Mbps
15.CERNET2 IX at Shanghai Jiaotong University240.0 Mbps
16.Tencent60.0 Mbps
17.Alisoft60.0 Mbps
18.Scuu90.0 Mbps
19.CTM Internet Service260.0 Mbps