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 (Nov 2023)

	ISP	IPv6 tests count
1.	Chinanet	3,691
2.	China Unicom Network	2,225
3.	China Mobile	1,886
4.	China Mobile communications corporation	922
5.	China Telecom	694
6.	Cngi-cernet2	256
7.	Cloudflare, Inc.	250
8.	Cernet	82
9.	China Next Generation Internet CERNET2	66
10.	CERNET2 IX at University of Science and Technology of China	64
11.	China Internet Network Information Center	28
12.	China Science and Technology Network	18
13.	Hangzhou Alibaba Advertising Co	17
14.	Hurricane Electric LLC	13
15.	Computer Network Information Center	12
16.	Tsinghua University	11
17.	Tianjin University IPv6 Campus Network	10
18.	CERNET2 IX at Huazhong University of Science and Technology	9
19.	IDC, China Telecommunications Corporation	8
20.	CERNET2 IX at Central South University	7
21.	Huashu media&Network Limited	6
22.	CERNET2 IX at Shanghai Jiaotong University	5
23.	Shenzhen Tencent Computer Systems Company Limited	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, Nov 2023)

	ISP	Unique IPv6 addresses
1.	Chinanet	2,472
2.	China Unicom Network	1,573
3.	China Mobile	1,422
4.	China Mobile communications corporation	655
5.	China Telecom	459
6.	Cloudflare, Inc.	219
7.	Cngi-cernet2	176
8.	Cernet	57
9.	China Next Generation Internet CERNET2	54
10.	China Internet Network Information Center	25
11.	China Science and Technology Network	18
12.	Hangzhou Alibaba Advertising Co	15
13.	Computer Network Information Center	10
14.	CERNET2 IX at University of Science and Technology of China	10
15.	Hurricane Electric LLC	8
16.	IDC, China Telecommunications Corporation	8
17.	Tsinghua University	7
18.	CERNET2 IX at Huazhong University of Science and Technology	6
19.	Shenzhen Tencent Computer Systems Company Limited	5
20.	CERNET2 IX at Central South University	4
21.	Huashu media&Network Limited	4
22.	CERNET2 IX at Shanghai Jiaotong University	3
23.	Tianjin University IPv6 Campus Network	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.

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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 (Nov 2023)

	ISP	Test count	IPv4	IPv4 %	IPv6	IPv6 %
1.	CERNET2 IX at Huazhong University of Science and Technology	9	0	0.0%	9	100.0%
2.	CERNET2 IX at Central South University	7	0	0.0%	7	100.0%
3.	Hangzhou Alibaba Advertising Co	17	1	5.9%	16	94.1%
4.	Tianjin University IPv6 Campus Network	10	1	10.0%	9	90.0%
5.	Cloudflare, Inc.	250	26	10.4%	224	89.6%
6.	Cernet	82	9	11.0%	73	89.0%
7.	Cngi-cernet2	256	33	12.9%	223	87.1%
8.	China Internet Network Information Center	28	4	14.3%	24	85.7%
9.	China Mobile	1,886	278	14.7%	1,608	85.3%
10.	China Science and Technology Network	18	3	16.7%	15	83.3%
11.	China Next Generation Internet CERNET2	66	12	18.2%	54	81.8%
12.	China Mobile communications corporation	922	198	21.5%	724	78.5%
13.	Computer Network Information Center	12	3	25.0%	9	75.0%
14.	China Telecom	694	174	25.1%	520	74.9%
15.	Tsinghua University	11	3	27.3%	8	72.7%
16.	Chinanet	3,691	1,065	28.9%	2,626	71.1%
17.	Hurricane Electric LLC	13	4	30.8%	9	69.2%
18.	CERNET2 IX at University of Science and Technology of China	64	23	35.9%	41	64.1%
19.	China Unicom Network	2,225	823	37.0%	1,402	63.0%
20.	CERNET2 IX at Shanghai Jiaotong University	5	2	40.0%	3	60.0%
21.	Shenzhen Tencent Computer Systems Company Limited	5	2	40.0%	3	60.0%
22.	Huashu media&Network Limited	6	3	50.0%	3	50.0%
23.	IDC, China Telecommunications Corporation	8	8	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 (Nov 2023)

	ISP	Test count	IPv6 average
1.	Cernet	82	66.5 Mbps
2.	Cloudflare, Inc.	250	45.3 Mbps
3.	China Telecom	694	40.4 Mbps
4.	China Mobile	1,886	29.4 Mbps
5.	China Unicom Network	2,225	25.6 Mbps
6.	Cngi-cernet2	256	24.2 Mbps
7.	China Mobile communications corporation	922	21.7 Mbps
8.	China Next Generation Internet CERNET2	66	18.4 Mbps
9.	CERNET2 IX at Shanghai Jiaotong University	5	14.7 Mbps
10.	Tianjin University IPv6 Campus Network	10	10.4 Mbps
11.	China Science and Technology Network	18	10.3 Mbps
12.	Chinanet	3,691	5.8 Mbps
13.	Computer Network Information Center	12	3.6 Mbps
14.	CERNET2 IX at Central South University	7	1.5 Mbps
15.	Hangzhou Alibaba Advertising Co	17	0.0 Mbps
16.	Hurricane Electric LLC	13	0.0 Mbps
17.	CERNET2 IX at Huazhong University of Science and Technology	9	0.0 Mbps
18.	China Internet Network Information Center	28	0.0 Mbps
19.	Tsinghua University	11	0.0 Mbps
20.	IDC, China Telecommunications Corporation	8	0.0 Mbps
21.	Shenzhen Tencent Computer Systems Company Limited	5	0.0 Mbps
22.	CERNET2 IX at University of Science and Technology of China	64	0.0 Mbps
23.	Huashu media&Network Limited	6	0.0 Mbps

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