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 (May 2017)

  ISP IPv6 tests count
1.Cngi-cernet22,812
2.Zparknet1,804
3.Hurricane Electric1,247
4.Cernet638
5.Hust6-cernet630
6.Cernet2-tsinghua6616
7.Zsu6-cernet479
8.Buaa6-cernet2373
9.Cernet2-tju6318
10.Xidian6-cernet299
11.CT Networks297
12.Cstnet-cnnic246
13.Dlut6-cernet2237
14.Szu6-cernet172
15.Whu6-cernet163
16.Pku6-cernet2156
17.China Unicom107
18.CTM Internet Service105
19.Apnic Portables8100
20.Chinanet-gd98
21.Neu6-cernet294
22.Cernet2-sjtu684
23.China Unicom Beijing Province Network83
24.Szuc6-cernet80
25.Sjtu6-cernet276

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, May 2017)

  ISP Unique IPv6 addresses
1.Cngi-cernet21,792
2.Hurricane Electric771
3.Zparknet545
4.Cernet2-tsinghua6381
5.Cernet375
6.Buaa6-cernet2262
7.Hust6-cernet260
8.Zsu6-cernet246
9.Cernet2-tju6243
10.CT Networks175
11.Cstnet-cnnic153
12.Xidian6-cernet142
13.Dlut6-cernet2105
14.Pku6-cernet2104
15.Whu6-cernet91
16.Szu6-cernet81
17.CTM Internet Service76
18.Chinanet-gd75
19.Neu6-cernet265
20.Cernet2-sjtu660
21.China Unicom55
22.China Unicom Beijing Province Network55
23.Nankai6-cernet47
24.Sdu6-cernet247
25.Cstnet47

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 (May 2017)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.Pbsl500.0%5100.0%
2.Ahu6-cernet1500.0%15100.0%
3.Scu6-cernet3200.0%32100.0%
4.Swufe6-cernet600.0%6100.0%
5.Zzu6-cernet600.0%6100.0%
6.Zzu6-cernet23512.9%3497.1%
7.Apnic Portables810033.0%9797.0%
8.Zzgiant5235.8%4994.2%
9.Cau6-cernet3226.3%3093.8%
10.Ustc6-cernet23026.7%2893.3%
11.Hunu6-cernet3026.7%2893.3%
12.Nankai6-cernet7256.9%6793.1%
13.Jlu6-cernet25347.5%4992.5%
14.Ncust6-cernet2328.7%2191.3%
15.Cer2bkb6-cernet21119.1%1090.9%
16.Tongji6-cernet23239.4%2990.6%
17.Chd6-cernet7114.3%685.7%
18.Szu6-cernet1722514.5%14785.5%
19.Sjtu6-cernet2761215.8%6484.2%
20.Buct6-cernet47817.0%3983.0%
21.Szuc6-cernet801417.5%6682.5%
22.Sdu6-cernet2571017.5%4782.5%
23.Nwpu6-cernet611118.0%5082.0%
24.Uestc6-cernet211218.2%981.8%
25.Buaa6-cernet23736918.5%30481.5%

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 (May 2017)

  ISP Test count IPv6 average
1.Google Inc.5141.2 Mbps
2.Cau6-cernet3227.7 Mbps
3.Cernet2-ruc64927.7 Mbps
4.CTM Internet Service10524.3 Mbps
5.American Registry Internet Numbers619.8 Mbps
6.Chinanet-fj1116.8 Mbps
7.Cernet63811.2 Mbps
8.Cernet2-sjtu68410.1 Mbps
9.Hurricane Electric1,2479.7 Mbps
10.Xmu6-cernet2349.1 Mbps
11.Cumtb6-cernet448.6 Mbps
12.Hunu6-cernet308.2 Mbps
13.Cntcl257.7 Mbps
14.Jlu6-cernet2537.6 Mbps
15.Cngi-cernet22,8127.3 Mbps
16.Buaa6-cernet23737.0 Mbps
17.Cernet2-tju63186.9 Mbps
18.Cstnet-cnnic2466.9 Mbps
19.Szu6-cernet1726.3 Mbps
20.Tongji6-cernet2326.2 Mbps
21.Sdu6-cernet2576.2 Mbps
22.Sjtu6-cernet2766.0 Mbps
23.Szuc6-cernet805.9 Mbps
24.Pku6-cernet21565.7 Mbps
25.Dlut6-cernet22375.2 Mbps