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 2019)

  ISP IPv6 tests count
1.China Unicom Network5,123
2.China Mobile communications corporation1,708
3.China Mobile1,318
4.Cernet1,312
5.Chinanet803
6.China Next Generation Internet CERNET2673
7.Cngi-cernet2533
8.Hurricane Electric LLC101
9.Zparknet77
10.Cernet2-tsinghua672
11.DMIT Inc57
12.CERNET2 IX at Tianjin University44
13.Baidu41
14.Cstnet-cnnic32
15.Cstnet29
16.China Unicom Anhui Province Network12
17.CTM Internet Service8
18.CERNET2 IX at Shanghai Jiaotong University8
19.BeiJing-Telecom-UserAddress-lowguaranteed7
20.Ihep7
21.Kuaishou-kj7
22.Linode6

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 2019)

  ISP Unique IPv6 addresses
1.China Unicom Network3,965
2.China Mobile communications corporation1,229
3.Cernet968
4.China Mobile929
5.China Next Generation Internet CERNET2496
6.Chinanet483
7.Cngi-cernet2366
8.Hurricane Electric LLC76
9.Cernet2-tsinghua651
10.Zparknet48
11.CERNET2 IX at Tianjin University36
12.Cstnet-cnnic27
13.Baidu22
14.Cstnet20
15.DMIT Inc14
16.CTM Internet Service8
17.China Unicom Anhui Province Network8
18.BeiJing-Telecom-UserAddress-lowguaranteed7
19.CERNET2 IX at Shanghai Jiaotong University5
20.Ihep4
21.Kuaishou-kj4
22.Linode3

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 2019)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.Linode600.0%6100.0%
2.Hurricane Electric LLC101109.9%9190.1%
3.CTM Internet Service8112.5%787.5%
4.Cstnet29413.8%2586.2%
5.Ihep7114.3%685.7%
6.Cstnet-cnnic32515.6%2784.4%
7.China Unicom Network5,12395418.6%4,16981.4%
8.Cernet1,31224718.8%1,06581.2%
9.China Mobile1,31828221.4%1,03678.6%
10.China Mobile communications corporation1,70836921.6%1,33978.4%
11.China Next Generation Internet CERNET267316524.5%50875.5%
12.Cernet2-tsinghua6721926.4%5373.6%
13.Cngi-cernet253315228.5%38171.5%
14.Kuaishou-kj7228.6%571.4%
15.Baidu411434.1%2765.9%
16.CERNET2 IX at Shanghai Jiaotong University8337.5%562.5%
17.Chinanet80330638.1%49761.9%
18.BeiJing-Telecom-UserAddress-lowguaranteed7342.9%457.1%
19.CERNET2 IX at Tianjin University442147.7%2352.3%
20.Zparknet774254.5%3545.5%
21.DMIT Inc575291.2%58.8%
22.China Unicom Anhui Province Network1212100.0%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 (Dec 2019)

  ISP Test count IPv6 average
1.Hurricane Electric LLC10154.3 Mbps
2.DMIT Inc5733.4 Mbps
3.China Unicom Network5,1238.7 Mbps
4.China Mobile communications corporation1,7087.6 Mbps
5.China Mobile1,3187.1 Mbps
6.Ihep70.8 Mbps
7.Cernet2-tsinghua6720.1 Mbps
8.Cngi-cernet25330.1 Mbps
9.China Next Generation Internet CERNET26730.1 Mbps
10.Cstnet-cnnic320.1 Mbps
11.Zparknet770.1 Mbps
12.Cernet1,3120.1 Mbps
13.Cstnet290.1 Mbps
14.Chinanet8030.1 Mbps
15.Baidu410.0 Mbps
16.CERNET2 IX at Tianjin University440.0 Mbps
17.CTM Internet Service80.0 Mbps
18.China Unicom Anhui Province Network120.0 Mbps
19.CERNET2 IX at Shanghai Jiaotong University80.0 Mbps
20.BeiJing-Telecom-UserAddress-lowguaranteed70.0 Mbps
21.Linode60.0 Mbps
22.Kuaishou-kj70.0 Mbps