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 (Mar 2019)

	ISP	IPv6 tests count
1.	CT Networks	3,210
2.	China Mobile	2,518
3.	China Unicom Network	1,934
4.	China Next Generation Internet CERNET2	1,805
5.	Cngi-cernet2	1,403
6.	Cernet	470
7.	Zparknet	325
8.	CERNET2 IX at Tianjin University	170
9.	Hurricane Electric LLC	170
10.	Cernet2-tsinghua6	150
11.	Cstnet	99
12.	Cstnet-cnnic	71
13.	No.31, Jin-rong Street	69
14.	Hurricane Electric	53
15.	CERNET2 IX at Shanghai Jiaotong University	30
16.	China Mobile communications corporation	23
17.	CTM Internet Service	19
18.	China Telecom (Group)	17
19.	CERNET2 IX at Peking University	17
20.	Dmitinc	15
21.	Wowrack.com	13
22.	ZhengZhou GIANT Computer Network Technology Co., Ltd	13
23.	Us-dmitinc	12
24.	Choopa	7
25.	China Unicom CHINA169 Jiangsu Province Network	6

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, Mar 2019)

	ISP	Unique IPv6 addresses
1.	CT Networks	2,079
2.	China Mobile	1,804
3.	China Unicom Network	1,358
4.	China Next Generation Internet CERNET2	1,265
5.	Cngi-cernet2	982
6.	Cernet	321
7.	Zparknet	173
8.	Cernet2-tsinghua6	113
9.	Hurricane Electric LLC	113
10.	CERNET2 IX at Tianjin University	99
11.	Cstnet	76
12.	Cstnet-cnnic	54
13.	No.31, Jin-rong Street	50
14.	CERNET2 IX at Shanghai Jiaotong University	25
15.	Hurricane Electric	23
16.	CTM Internet Service	19
17.	China Mobile communications corporation	16
18.	China Telecom (Group)	14
19.	CERNET2 IX at Peking University	12
20.	ZhengZhou GIANT Computer Network Technology Co., Ltd	10
21.	Dmitinc	9
22.	Us-dmitinc	6
23.	Choopa	5
24.	Mailing Services	5
25.	CERNET New Technology Co	4

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 (Mar 2019)

	ISP	Test count	IPv4	IPv4 %	IPv6	IPv6 %
1.	Wowrack.com	13	0	0.0%	13	100.0%
2.	Cernet2-tsinghua6	150	20	13.3%	130	86.7%
3.	Cstnet	99	17	17.2%	82	82.8%
4.	China Next Generation Internet CERNET2	1,805	343	19.0%	1,462	81.0%
5.	CERNET New Technology Co	5	1	20.0%	4	80.0%
6.	Hurricane Electric	53	11	20.8%	42	79.2%
7.	CTM Internet Service	19	4	21.1%	15	78.9%
8.	Cernet	470	107	22.8%	363	77.2%
9.	CERNET2 IX at Shanghai Jiaotong University	30	7	23.3%	23	76.7%
10.	Cngi-cernet2	1,403	335	23.9%	1,068	76.1%
11.	Hurricane Electric LLC	170	41	24.1%	129	75.9%
12.	China Mobile	2,518	625	24.8%	1,893	75.2%
13.	Choopa	7	2	28.6%	5	71.4%
14.	Mailing Services	6	2	33.3%	4	66.7%
15.	CERNET2 IX at Tianjin University	170	57	33.5%	113	66.5%
16.	Cstnet-cnnic	71	24	33.8%	47	66.2%
17.	China Unicom Network	1,934	683	35.3%	1,251	64.7%
18.	CT Networks	3,210	1,204	37.5%	2,006	62.5%
19.	CERNET2 IX at Peking University	17	8	47.1%	9	52.9%
20.	Zparknet	325	174	53.5%	151	46.5%
21.	ZhengZhou GIANT Computer Network Technology Co., Ltd	13	7	53.8%	6	46.2%
22.	Dmitinc	15	10	66.7%	5	33.3%
23.	Us-dmitinc	12	9	75.0%	3	25.0%
24.	China Mobile communications corporation	23	20	87.0%	3	13.0%
25.	No.31, Jin-rong Street	69	61	88.4%	8	11.6%

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 (Mar 2019)

	ISP	Test count	IPv6 average
1.	Hurricane Electric	53	33.2 Mbps
2.	CNC Group CHINA169 Xinjiang Province Network	5	15.8 Mbps
3.	No.31, Jin-rong Street	69	10.9 Mbps
4.	Cstnet-cnnic	71	6.4 Mbps
5.	Mailing Services	6	5.5 Mbps
6.	Cstnet	99	4.1 Mbps
7.	Us-dmitinc	12	3.1 Mbps
8.	China Unicom Network	1,934	3.1 Mbps
9.	China Mobile	2,518	1.9 Mbps
10.	CT Networks	3,210	0.8 Mbps
11.	ZhengZhou GIANT Computer Network Technology Co., Ltd	13	0.3 Mbps
12.	Cngi-cernet2	1,403	0.1 Mbps
13.	Cernet2-tsinghua6	150	0.1 Mbps
14.	China Next Generation Internet CERNET2	1,805	0.1 Mbps
15.	CERNET2 IX at Peking University	17	0.1 Mbps
16.	CERNET2 IX at Shanghai Jiaotong University	30	0.1 Mbps
17.	Cernet	470	0.1 Mbps
18.	CERNET2 IX at Tianjin University	170	0.1 Mbps
19.	Zparknet	325	0.1 Mbps
20.	CERNET New Technology Co	5	0.0 Mbps
21.	China Unicom CHINA169 Jiangsu Province Network	6	0.0 Mbps
22.	Dmitinc	15	0.0 Mbps
23.	Wowrack.com	13	0.0 Mbps
24.	CTM Internet Service	19	0.0 Mbps
25.	China Mobile communications corporation	23	0.0 Mbps