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 (Jan 2019)

	ISP	IPv6 tests count
1.	CT Networks	5,500
2.	China Unicom Network	4,400
3.	China Mobile	3,798
4.	China Next Generation Internet CERNET2	1,782
5.	Cngi-cernet2	1,322
6.	Zparknet	462
7.	Cernet	304
8.	Cernet2-tsinghua6	267
9.	Hurricane Electric LLC	192
10.	CERNET2 IX at Tianjin University	162
11.	Cstnet	156
12.	China Unicom Beijing Province Network	152
13.	No.31, Jin-rong Street	124
14.	Wowrack.com	55
15.	Us-dmitinc	53
16.	Cstnet-cnnic	51
17.	Qihoo	50
18.	China Mobile communications corporation	44
19.	Heyixinxi	29
20.	CERNET2 IX at Peking University	27
21.	China Unicom Anhui Province Network	14
22.	CERNET New Technology Co	13
23.	Hurricane Electric	13
24.	CERNET2 IX at Shanghai Jiaotong University	12
25.	China Telecom (Group)	11

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, Jan 2019)

	ISP	Unique IPv6 addresses
1.	CT Networks	3,507
2.	China Unicom Network	2,990
3.	China Mobile	2,584
4.	China Next Generation Internet CERNET2	1,277
5.	Cngi-cernet2	871
6.	Zparknet	245
7.	Cernet	232
8.	Cernet2-tsinghua6	176
9.	Hurricane Electric LLC	152
10.	CERNET2 IX at Tianjin University	118
11.	Cstnet	110
12.	No.31, Jin-rong Street	100
13.	Cstnet-cnnic	44
14.	China Unicom Beijing Province Network	38
15.	Qihoo	37
16.	China Mobile communications corporation	33
17.	Us-dmitinc	32
18.	CERNET2 IX at Peking University	23
19.	Heyixinxi	18
20.	CERNET2 IX at Shanghai Jiaotong University	11
21.	China Unicom Anhui Province Network	11
22.	Hurricane Electric	9
23.	China Telecom (Group)	8
24.	CTM Internet Service	8
25.	CNC Group CHINA169 Shandong Province Network	8

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 (Jan 2019)

	ISP	Test count	IPv4	IPv4 %	IPv6	IPv6 %
1.	Wowrack.com	55	0	0.0%	55	100.0%
2.	CERNET New Technology Co	13	0	0.0%	13	100.0%
3.	Huashu media&Network Limited	5	0	0.0%	5	100.0%
4.	China Education and Research Network Center	5	0	0.0%	5	100.0%
5.	Cstnet	156	16	10.3%	140	89.7%
6.	Hurricane Electric LLC	192	23	12.0%	169	88.0%
7.	CTM Internet Service	8	1	12.5%	7	87.5%
8.	15F, Ideal Plaza No.58 Bei Si Huan Xi Road	8	1	12.5%	7	87.5%
9.	Cngi-cernet2	1,322	188	14.2%	1,134	85.8%
10.	Cernet2-tsinghua6	267	39	14.6%	228	85.4%
11.	Hurricane Electric	13	2	15.4%	11	84.6%
12.	Qihoo	50	8	16.0%	42	84.0%
13.	China Next Generation Internet CERNET2	1,782	297	16.7%	1,485	83.3%
14.	Cernet	304	53	17.4%	251	82.6%
15.	ZhengZhou GIANT Computer Network Technology Co., Ltd	5	1	20.0%	4	80.0%
16.	CERNET2 IX at Peking University	27	6	22.2%	21	77.8%
17.	China Unicom Network	4,400	1,203	27.3%	3,197	72.7%
18.	China Mobile	3,798	1,067	28.1%	2,731	71.9%
19.	Ihep	7	2	28.6%	5	71.4%
20.	Cstnet-cnnic	51	15	29.4%	36	70.6%
21.	CT Networks	5,500	1,822	33.1%	3,678	66.9%
22.	CERNET2 IX at Tianjin University	162	55	34.0%	107	66.0%
23.	Zparknet	462	211	45.7%	251	54.3%
24.	Heyixinxi	29	14	48.3%	15	51.7%
25.	CERNET2 IX at Shanghai Jiaotong University	12	6	50.0%	6	50.0%

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 (Jan 2019)

	ISP	Test count	IPv6 average
1.	Cernet2-tsinghua6	267	12.0 Mbps
2.	Us-dmitinc	53	10.2 Mbps
3.	China Unicom Network	4,400	5.8 Mbps
4.	Cngi-cernet2	1,322	4.9 Mbps
5.	CT Networks	5,500	3.5 Mbps
6.	China Mobile	3,798	3.4 Mbps
7.	Hurricane Electric	13	2.8 Mbps
8.	No.31, Jin-rong Street	124	2.3 Mbps
9.	China Next Generation Internet CERNET2	1,782	1.7 Mbps
10.	Choopa	7	1.7 Mbps
11.	Qihoo	50	1.3 Mbps
12.	China Telecom (Group)	11	1.3 Mbps
13.	Cernet	304	0.9 Mbps
14.	China Unicom Beijing Province Network	152	0.7 Mbps
15.	China Unicom CHINA169 Jiangsu Province Network	5	0.7 Mbps
16.	Zparknet	462	0.6 Mbps
17.	China Education and Research Network Center	5	0.4 Mbps
18.	China Mobile communications corporation	44	0.4 Mbps
19.	Cstnet	156	0.2 Mbps
20.	CERNET2 IX at Tianjin University	162	0.2 Mbps
21.	Hurricane Electric LLC	192	0.2 Mbps
22.	CERNET2 IX at Shanghai Jiaotong University	12	0.2 Mbps
23.	CERNET2 IX at Peking University	27	0.1 Mbps
24.	Cstnet-cnnic	51	0.1 Mbps
25.	Ihep	7	0.1 Mbps