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 (Jul 2017)

  ISP IPv6 tests count
1.Cngi-cernet22,363
2.Zparknet1,411
3.Hurricane Electric1,153
4.Cernet2-tsinghua6511
5.Cernet492
6.Zsu6-cernet441
7.Hust6-cernet424
8.Buaa6-cernet2354
9.Cernet2-tju6320
10.CT Networks296
11.Dlut6-cernet2237
12.Szu6-cernet195
13.Cstnet-cnnic190
14.Xidian6-cernet184
15.Pku6-cernet2182
16.Chinanet-gd171
17.Cstnet150
18.China Unicom145
19.Whu6-cernet135
20.CTM Internet Service129
21.Sjtu6-cernet2118
22.Tju6-cernet298
23.China Mobile communications corporation90
24.Nankai6-cernet89
25.Cernet2-ruc688

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, Jul 2017)

  ISP Unique IPv6 addresses
1.Cngi-cernet21,507
2.Hurricane Electric736
3.Zparknet499
4.Cernet328
5.Cernet2-tsinghua6314
6.Buaa6-cernet2250
7.Cernet2-tju6220
8.Hust6-cernet205
9.CT Networks193
10.Zsu6-cernet192
11.Pku6-cernet2140
12.Cstnet121
13.Cstnet-cnnic111
14.Xidian6-cernet107
15.China Unicom104
16.Chinanet-gd102
17.CTM Internet Service95
18.Szu6-cernet82
19.Whu6-cernet75
20.Dlut6-cernet274
21.China Mobile communications corporation60
22.China Unicom Beijing Province Network56
23.Nankai6-cernet55
24.Neu6-cernet254
25.Cernet2-ruc652

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 (Jul 2017)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.Zzu6-cernet500.0%5100.0%
2.Shanghai2600.0%6100.0%
3.Xtom-hkg500.0%5100.0%
4.Cer2bkb6-cernet21200.0%12100.0%
5.Scu6-cernet3200.0%32100.0%
6.Rixcloudchina4200.0%42100.0%
7.Whu6-cernet13553.7%13096.3%
8.Ncust6-cernet2214.5%2195.5%
9.Bjmu6-cernet2114.8%2095.2%
10.Zzgiant6134.9%5895.1%
11.Hunu6-cernet1516.7%1493.3%
12.Jlu6-cernet25647.1%5292.9%
13.Szu6-cernet195147.2%18192.8%
14.Sjtu6-cernet211897.6%10992.4%
15.Nankai6-cernet8977.9%8292.1%
16.Cqu6-cernet23638.3%3391.7%
17.Ahu6-cernet2328.7%2191.3%
18.Csu6-cernet9111.1%888.9%
19.Sdu6-cernet251611.8%4588.2%
20.Tongji6-cernet224312.5%2187.5%
21.Tsinghua6-cernet216212.5%1487.5%
22.Xjtu6-cernet38513.2%3386.8%
23.Xidian6-cernet1842513.6%15986.4%
24.Nstuaf6-cernet14214.3%1285.7%
25.Hrbeu6-cernet48714.6%4185.4%

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 (Jul 2017)

  ISP Test count IPv6 average
1.CTM Internet Service12941.4 Mbps
2.Rixcloudchina4241.0 Mbps
3.Cau6-cernet2627.1 Mbps
4.China Unicom14524.0 Mbps
5.Chinanet-fj2816.8 Mbps
6.Ihep2516.6 Mbps
7.Szu6-cernet19516.0 Mbps
8.CNC Group CHINA169 Shanghai Province Network715.3 Mbps
9.China Unicom Hubei Province Network1915.3 Mbps
10.Cumtb6-cernet2813.4 Mbps
11.Jlu6-cernet25613.2 Mbps
12.Sjtu6-cernet211812.3 Mbps
13.China Unicom Shandong Province Network1811.9 Mbps
14.Cstnet15011.7 Mbps
15.Tongji6-cernet22411.5 Mbps
16.Buct6-cernet6711.4 Mbps
17.Cntcl4111.0 Mbps
18.Hurricane Electric1,15310.8 Mbps
19.Jiangsu Network of ChinaTelecom510.7 Mbps
20.Choopa1610.6 Mbps
21.Cernet49210.2 Mbps
22.Shanghai269.9 Mbps
23.Pku6-cernet21829.9 Mbps
24.Cernet2-tsinghua65119.1 Mbps
25.Bjmu6-cernet219.1 Mbps