IPv6 test - Statistics for 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-cernet2	2,363
2.	Zparknet	1,411
3.	Hurricane Electric	1,153
4.	Cernet2-tsinghua6	511
5.	Cernet	492
6.	Zsu6-cernet	441
7.	Hust6-cernet	424
8.	Buaa6-cernet2	354
9.	Cernet2-tju6	320
10.	CT Networks	296
11.	Dlut6-cernet2	237
12.	Szu6-cernet	195
13.	Cstnet-cnnic	190
14.	Xidian6-cernet	184
15.	Pku6-cernet2	182
16.	Chinanet-gd	171
17.	Cstnet	150
18.	China Unicom	145
19.	Whu6-cernet	135
20.	CTM Internet Service	129
21.	Sjtu6-cernet2	118
22.	Tju6-cernet2	98
23.	China Mobile communications corporation	90
24.	Nankai6-cernet	89
25.	Cernet2-ruc6	88

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-cernet2	1,507
2.	Hurricane Electric	736
3.	Zparknet	499
4.	Cernet	328
5.	Cernet2-tsinghua6	314
6.	Buaa6-cernet2	250
7.	Cernet2-tju6	220
8.	Hust6-cernet	205
9.	CT Networks	193
10.	Zsu6-cernet	192
11.	Pku6-cernet2	140
12.	Cstnet	121
13.	Cstnet-cnnic	111
14.	Xidian6-cernet	107
15.	China Unicom	104
16.	Chinanet-gd	102
17.	CTM Internet Service	95
18.	Szu6-cernet	82
19.	Whu6-cernet	75
20.	Dlut6-cernet2	74
21.	China Mobile communications corporation	60
22.	China Unicom Beijing Province Network	56
23.	Nankai6-cernet	55
24.	Neu6-cernet2	54
25.	Cernet2-ruc6	52

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-cernet	5	0	0.0%	5	100.0%
2.	Shanghai2	6	0	0.0%	6	100.0%
3.	Xtom-hkg	5	0	0.0%	5	100.0%
4.	Cer2bkb6-cernet2	12	0	0.0%	12	100.0%
5.	Scu6-cernet	32	0	0.0%	32	100.0%
6.	Rixcloudchina	42	0	0.0%	42	100.0%
7.	Whu6-cernet	135	5	3.7%	130	96.3%
8.	Ncust6-cernet	22	1	4.5%	21	95.5%
9.	Bjmu6-cernet	21	1	4.8%	20	95.2%
10.	Zzgiant	61	3	4.9%	58	95.1%
11.	Hunu6-cernet	15	1	6.7%	14	93.3%
12.	Jlu6-cernet2	56	4	7.1%	52	92.9%
13.	Szu6-cernet	195	14	7.2%	181	92.8%
14.	Sjtu6-cernet2	118	9	7.6%	109	92.4%
15.	Nankai6-cernet	89	7	7.9%	82	92.1%
16.	Cqu6-cernet2	36	3	8.3%	33	91.7%
17.	Ahu6-cernet	23	2	8.7%	21	91.3%
18.	Csu6-cernet	9	1	11.1%	8	88.9%
19.	Sdu6-cernet2	51	6	11.8%	45	88.2%
20.	Tongji6-cernet2	24	3	12.5%	21	87.5%
21.	Tsinghua6-cernet2	16	2	12.5%	14	87.5%
22.	Xjtu6-cernet	38	5	13.2%	33	86.8%
23.	Xidian6-cernet	184	25	13.6%	159	86.4%
24.	Nstuaf6-cernet	14	2	14.3%	12	85.7%
25.	Hrbeu6-cernet	48	7	14.6%	41	85.4%

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 Service	129	41.4 Mbps
2.	Rixcloudchina	42	41.0 Mbps
3.	Cau6-cernet	26	27.1 Mbps
4.	China Unicom	145	24.0 Mbps
5.	Chinanet-fj	28	16.8 Mbps
6.	Ihep	25	16.6 Mbps
7.	Szu6-cernet	195	16.0 Mbps
8.	CNC Group CHINA169 Shanghai Province Network	7	15.3 Mbps
9.	China Unicom Hubei Province Network	19	15.3 Mbps
10.	Cumtb6-cernet	28	13.4 Mbps
11.	Jlu6-cernet2	56	13.2 Mbps
12.	Sjtu6-cernet2	118	12.3 Mbps
13.	China Unicom Shandong Province Network	18	11.9 Mbps
14.	Cstnet	150	11.7 Mbps
15.	Tongji6-cernet2	24	11.5 Mbps
16.	Buct6-cernet	67	11.4 Mbps
17.	Cntcl	41	11.0 Mbps
18.	Hurricane Electric	1,153	10.8 Mbps
19.	Jiangsu Network of ChinaTelecom	5	10.7 Mbps
20.	Choopa	16	10.6 Mbps
21.	Cernet	492	10.2 Mbps
22.	Shanghai2	6	9.9 Mbps
23.	Pku6-cernet2	182	9.9 Mbps
24.	Cernet2-tsinghua6	511	9.1 Mbps
25.	Bjmu6-cernet	21	9.1 Mbps