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 (Oct 2019)

  ISP IPv6 tests count
1.China Unicom Network1,877
2.China Mobile communications corporation1,297
3.China Mobile992
4.China Next Generation Internet CERNET2949
5.Chinanet481
6.Cngi-cernet2464
7.Zparknet262
8.Hurricane Electric LLC157
9.Cernet153
10.Cernet2-tsinghua6107
11.CERNET2 IX at Tianjin University60
12.Cstnet49
13.Cstnet-cnnic46
14.Guangzhou NetEase Computer System Co., Ltd.26
15.Kuaishou-kj25
16.Baidu25
17.DMIT Inc19
18.CERNET2 IX at Shanghai Jiaotong University15
19.China Telecom (Group)12
20.BeiJing-Telecom-UserAddress-lowguaranteed12
21.CTM Internet Service10
22.Ihep9
23.China Unicom Anhui Province Network6

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, Oct 2019)

  ISP Unique IPv6 addresses
1.China Unicom Network1,350
2.China Mobile communications corporation923
3.China Mobile734
4.China Next Generation Internet CERNET2654
5.Cngi-cernet2344
6.Chinanet322
7.Zparknet152
8.Hurricane Electric LLC119
9.Cernet109
10.Cernet2-tsinghua675
11.CERNET2 IX at Tianjin University43
12.Cstnet34
13.Cstnet-cnnic33
14.Kuaishou-kj21
15.Baidu20
16.CERNET2 IX at Shanghai Jiaotong University12
17.DMIT Inc11
18.China Telecom (Group)10
19.CTM Internet Service9
20.BeiJing-Telecom-UserAddress-lowguaranteed9
21.Guangzhou NetEase Computer System Co., Ltd.9
22.Ihep7
23.China Unicom Anhui Province Network6

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 (Oct 2019)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.CERNET2 IX at Shanghai Jiaotong University15213.3%1386.7%
2.Hurricane Electric LLC1572113.4%13686.6%
3.Guangzhou NetEase Computer System Co., Ltd.26415.4%2284.6%
4.Cstnet49918.4%4081.6%
5.Cernet1533019.6%12380.4%
6.CTM Internet Service10220.0%880.0%
7.Cstnet-cnnic461021.7%3678.3%
8.Cngi-cernet246410121.8%36378.2%
9.China Next Generation Internet CERNET294924325.6%70674.4%
10.China Mobile communications corporation1,29734326.4%95473.6%
11.Cernet2-tsinghua61072927.1%7872.9%
12.China Mobile99227227.4%72072.6%
13.China Unicom Network1,87753128.3%1,34671.7%
14.CERNET2 IX at Tianjin University602033.3%4066.7%
15.Baidu251040.0%1560.0%
16.Kuaishou-kj251144.0%1456.0%
17.Chinanet48122847.4%25352.6%
18.Ihep9555.6%444.4%
19.Zparknet26214856.5%11443.5%
20.BeiJing-Telecom-UserAddress-lowguaranteed12758.3%541.7%
21.DMIT Inc191578.9%421.1%
22.China Unicom Anhui Province Network66100.0%00.0%
23.China Telecom (Group)1212100.0%00.0%

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 (Oct 2019)

  ISP Test count IPv6 average
1.CERNET2 IX at Tianjin University609.6 Mbps
2.China Mobile9925.4 Mbps
3.China Unicom Network1,8775.0 Mbps
4.China Mobile communications corporation1,2974.3 Mbps
5.China Telecom (Group)121.7 Mbps
6.Cngi-cernet24640.8 Mbps
7.China Next Generation Internet CERNET29490.6 Mbps
8.Zparknet2620.2 Mbps
9.Cernet2-tsinghua61070.1 Mbps
10.Cernet1530.1 Mbps
11.Cstnet490.1 Mbps
12.Cstnet-cnnic460.1 Mbps
13.Chinanet4810.0 Mbps
14.China Unicom Anhui Province Network60.0 Mbps
15.BeiJing-Telecom-UserAddress-lowguaranteed120.0 Mbps
16.Kuaishou-kj250.0 Mbps
17.Baidu250.0 Mbps
18.CERNET2 IX at Shanghai Jiaotong University150.0 Mbps
19.Ihep90.0 Mbps
20.CTM Internet Service100.0 Mbps
21.DMIT Inc190.0 Mbps
22.Hurricane Electric LLC1570.0 Mbps
23.Guangzhou NetEase Computer System Co., Ltd.260.0 Mbps