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 (Sep 2019)

	ISP	IPv6 tests count
1.	China Unicom Network	1,794
2.	Chinanet	1,308
3.	China Next Generation Internet CERNET2	1,267
4.	China Mobile communications corporation	1,132
5.	China Mobile	991
6.	Cngi-cernet2	853
7.	Zparknet	432
8.	Cernet	384
9.	Hurricane Electric LLC	185
10.	CERNET2 IX at Tianjin University	160
11.	Cernet2-tsinghua6	156
12.	Cstnet-cnnic	73
13.	Cstnet	51
14.	DMIT Inc	38
15.	CTM Internet Service	34
16.	BeiJing-Telecom-UserAddress-lowguaranteed	20
17.	Heyixinxi	15
18.	China Unicom CHINA169 Anhui Province Network	13
19.	China Unicom Anhui Province Network	11
20.	CERNET2 IX at Shanghai Jiaotong University	8
21.	China Telecom (Group)	8
22.	Ihep	7
23.	Sjtug	6
24.	ZhengZhou GIANT Computer Network Technology Co., Ltd	6
25.	Kuaishou-kj	5

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, Sep 2019)

	ISP	Unique IPv6 addresses
1.	China Unicom Network	1,292
2.	China Next Generation Internet CERNET2	916
3.	China Mobile communications corporation	820
4.	Chinanet	755
5.	China Mobile	710
6.	Cngi-cernet2	585
7.	Cernet	262
8.	Zparknet	200
9.	Hurricane Electric LLC	131
10.	Cernet2-tsinghua6	108
11.	CERNET2 IX at Tianjin University	95
12.	Cstnet-cnnic	49
13.	Cstnet	43
14.	DMIT Inc	15
15.	BeiJing-Telecom-UserAddress-lowguaranteed	13
16.	Heyixinxi	12
17.	China Unicom CHINA169 Anhui Province Network	11
18.	CTM Internet Service	9
19.	China Unicom Anhui Province Network	8
20.	CERNET2 IX at Shanghai Jiaotong University	8
21.	Ihep	7
22.	China Telecom (Group)	6
23.	Kuaishou-kj	3
24.	Sjtug	3
25.	ZhengZhou GIANT Computer Network Technology Co., Ltd	3

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 (Sep 2019)

	ISP	Test count	IPv4	IPv4 %	IPv6	IPv6 %
1.	CERNET2 IX at Shanghai Jiaotong University	8	0	0.0%	8	100.0%
2.	Heyixinxi	15	2	13.3%	13	86.7%
3.	Hurricane Electric LLC	185	26	14.1%	159	85.9%
4.	Cstnet	51	10	19.6%	41	80.4%
5.	Cngi-cernet2	853	171	20.0%	682	80.0%
6.	Cernet2-tsinghua6	156	35	22.4%	121	77.6%
7.	China Mobile communications corporation	1,132	256	22.6%	876	77.4%
8.	Cernet	384	87	22.7%	297	77.3%
9.	China Next Generation Internet CERNET2	1,267	303	23.9%	964	76.1%
10.	China Mobile	991	238	24.0%	753	76.0%
11.	Cstnet-cnnic	73	18	24.7%	55	75.3%
12.	BeiJing-Telecom-UserAddress-lowguaranteed	20	5	25.0%	15	75.0%
13.	Ihep	7	2	28.6%	5	71.4%
14.	CERNET2 IX at Tianjin University	160	49	30.6%	111	69.4%
15.	China Unicom Network	1,794	550	30.7%	1,244	69.3%
16.	ZhengZhou GIANT Computer Network Technology Co., Ltd	6	2	33.3%	4	66.7%
17.	Chinanet	1,308	461	35.2%	847	64.8%
18.	Zparknet	432	244	56.5%	188	43.5%
19.	Kuaishou-kj	5	3	60.0%	2	40.0%
20.	DMIT Inc	38	23	60.5%	15	39.5%
21.	Alisoft	5	4	80.0%	1	20.0%
22.	CTM Internet Service	34	30	88.2%	4	11.8%
23.	China Unicom Anhui Province Network	11	11	100.0%	0	0.0%
24.	China Unicom CHINA169 Anhui Province Network	13	13	100.0%	0	0.0%
25.	Sjtug	6	6	100.0%	0	0.0%

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 (Sep 2019)

	ISP	Test count	IPv6 average
1.	China Mobile	991	10.5 Mbps
2.	China Mobile communications corporation	1,132	7.2 Mbps
3.	DMIT Inc	38	4.6 Mbps
4.	Chinanet	1,308	4.2 Mbps
5.	China Unicom Network	1,794	0.9 Mbps
6.	China Telecom (Group)	8	0.2 Mbps
7.	Cstnet-cnnic	73	0.2 Mbps
8.	CERNET2 IX at Shanghai Jiaotong University	8	0.2 Mbps
9.	ZhengZhou GIANT Computer Network Technology Co., Ltd	6	0.1 Mbps
10.	Cngi-cernet2	853	0.1 Mbps
11.	Cernet	384	0.1 Mbps
12.	CERNET2 IX at Tianjin University	160	0.1 Mbps
13.	Zparknet	432	0.1 Mbps
14.	China Next Generation Internet CERNET2	1,267	0.1 Mbps
15.	Cernet2-tsinghua6	156	0.1 Mbps
16.	Cstnet	51	0.1 Mbps
17.	BeiJing-Telecom-UserAddress-lowguaranteed	20	0.0 Mbps
18.	Hurricane Electric LLC	185	0.0 Mbps
19.	Sjtug	6	0.0 Mbps
20.	CTM Internet Service	34	0.0 Mbps
21.	China Unicom CHINA169 Anhui Province Network	13	0.0 Mbps
22.	Alisoft	5	0.0 Mbps
23.	Heyixinxi	15	0.0 Mbps
24.	Kuaishou-kj	5	0.0 Mbps
25.	China Unicom Anhui Province Network	11	0.0 Mbps