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 (Apr 2020)

  ISP IPv6 tests count
1.Chinanet6,496
2.China Unicom Network2,992
3.China Mobile communications corporation2,170
4.China Mobile1,744
5.Hurricane Electric LLC143
6.China Next Generation Internet CERNET2132
7.Baidu86
8.Cngi-cernet255
9.Cernet45
10.Alisoft21
11.CTM Internet Service20
12.Cernet2-tsinghua616
13.Zparknet15
14.Cstnet14
15.DMIT Inc11
16.Google LLC9
17.Heyixinxi9
18.Tencent7
19.Guangzhou NetEase Computer System Co., Ltd.6
20.Globalnet Communication Ltd.6
21.Chinanet Guangdong Province Network6
22.China Telecom (Group6
23.CNCGroup CHINA169 FuJian 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, Apr 2020)

  ISP Unique IPv6 addresses
1.Chinanet4,112
2.China Unicom Network2,188
3.China Mobile communications corporation1,438
4.China Mobile1,241
5.China Next Generation Internet CERNET293
6.Hurricane Electric LLC73
7.Baidu52
8.Cngi-cernet238
9.Cernet32
10.CTM Internet Service15
11.Cernet2-tsinghua613
12.Cstnet8
13.Heyixinxi7
14.DMIT Inc6
15.Tencent6
16.Alisoft5
17.Globalnet Communication Ltd.5
18.Google LLC5
19.CNCGroup CHINA169 FuJian province network5
20.China Telecom (Group4
21.Chinanet Guangdong Province Network3
22.Guangzhou NetEase Computer System Co., Ltd.2
23.Zparknet2

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 (Apr 2020)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.Globalnet Communication Ltd.600.0%6100.0%
2.Tencent700.0%7100.0%
3.Zparknet1500.0%15100.0%
4.Heyixinxi9111.1%888.9%
5.Cernet45613.3%3986.7%
6.CTM Internet Service20315.0%1785.0%
7.China Telecom (Group6116.7%583.3%
8.Hurricane Electric LLC1432819.6%11580.4%
9.Cngi-cernet2551120.0%4480.0%
10.China Next Generation Internet CERNET21323224.2%10075.8%
11.Alisoft21628.6%1571.4%
12.China Unicom Network2,99291230.5%2,08069.5%
13.Baidu862933.7%5766.3%
14.Cstnet14535.7%964.3%
15.Chinanet6,4962,51938.8%3,97761.2%
16.China Mobile1,74474342.6%1,00157.4%
17.China Mobile communications corporation2,1701,06148.9%1,10951.1%
18.Guangzhou NetEase Computer System Co., Ltd.6350.0%350.0%
19.Cernet2-tsinghua6161062.5%637.5%
20.CNCGroup CHINA169 FuJian province network6466.7%233.3%
21.DMIT Inc11981.8%218.2%
22.Chinanet Guangdong Province Network66100.0%00.0%
23.Google LLC99100.0%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 (Apr 2020)

  ISP Test count IPv6 average
1.Cngi-cernet25536.0 Mbps
2.China Next Generation Internet CERNET21328.7 Mbps
3.Hurricane Electric LLC1437.3 Mbps
4.China Unicom Network2,9926.1 Mbps
5.Cernet455.6 Mbps
6.China Mobile communications corporation2,1702.5 Mbps
7.China Mobile1,7441.4 Mbps
8.Chinanet6,4960.0 Mbps
9.DMIT Inc110.0 Mbps
10.Baidu860.0 Mbps
11.Cstnet140.0 Mbps
12.Guangzhou NetEase Computer System Co., Ltd.60.0 Mbps
13.Cernet2-tsinghua6160.0 Mbps
14.Zparknet150.0 Mbps
15.Alisoft210.0 Mbps
16.Globalnet Communication Ltd.60.0 Mbps
17.Chinanet Guangdong Province Network60.0 Mbps
18.CTM Internet Service200.0 Mbps
19.Google LLC90.0 Mbps
20.China Telecom (Group60.0 Mbps
21.Heyixinxi90.0 Mbps
22.Tencent70.0 Mbps
23.CNCGroup CHINA169 FuJian province network60.0 Mbps