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 (Aug 2023)

	ISP	IPv6 tests count
1.	Chinanet	1,447
2.	China Unicom Network	1,238
3.	China Mobile	1,056
4.	China Mobile communications corporation	472
5.	China Telecom	196
6.	Cloudflare, Inc.	74
7.	Cngi-cernet2	72
8.	China Internet Network Information Center	21
9.	China Next Generation Internet CERNET2	18
10.	Cernet	15
11.	Hangzhou Alibaba Advertising Co	13
12.	Beijing Baidu Netcom Science and Technology Co., Ltd.	9
13.	CERNET2 IX at Huazhong University of Science and Technology	8
14.	Tianjin University IPv6 Campus Network	6
15.	Shenzhen Tencent Computer Systems Company Limited	6
16.	China Science and Technology Network	6
17.	Computer Network Information Center	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, Aug 2023)

	ISP	Unique IPv6 addresses
1.	Chinanet	1,056
2.	China Unicom Network	912
3.	China Mobile	786
4.	China Mobile communications corporation	378
5.	China Telecom	142
6.	Cloudflare, Inc.	68
7.	Cngi-cernet2	59
8.	China Internet Network Information Center	17
9.	China Next Generation Internet CERNET2	16
10.	Cernet	12
11.	Hangzhou Alibaba Advertising Co	10
12.	Beijing Baidu Netcom Science and Technology Co., Ltd.	8
13.	China Science and Technology Network	6
14.	Tianjin University IPv6 Campus Network	4
15.	Shenzhen Tencent Computer Systems Company Limited	4
16.	Computer Network Information Center	4
17.	CERNET2 IX at Huazhong University of Science and Technology	2

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 (Aug 2023)

	ISP	Test count	IPv4	IPv4 %	IPv6	IPv6 %
1.	CERNET2 IX at Huazhong University of Science and Technology	8	1	12.5%	7	87.5%
2.	Cloudflare, Inc.	74	13	17.6%	61	82.4%
3.	Shenzhen Tencent Computer Systems Company Limited	6	2	33.3%	4	66.7%
4.	Beijing Baidu Netcom Science and Technology Co., Ltd.	9	4	44.4%	5	55.6%
5.	China Unicom Network	1,238	608	49.1%	630	50.9%
6.	China Next Generation Internet CERNET2	18	9	50.0%	9	50.0%
7.	China Mobile communications corporation	472	237	50.2%	235	49.8%
8.	China Mobile	1,056	533	50.5%	523	49.5%
9.	China Telecom	196	100	51.0%	96	49.0%
10.	China Internet Network Information Center	21	11	52.4%	10	47.6%
11.	Cngi-cernet2	72	38	52.8%	34	47.2%
12.	Chinanet	1,447	772	53.4%	675	46.6%
13.	Cernet	15	9	60.0%	6	40.0%
14.	Computer Network Information Center	5	3	60.0%	2	40.0%
15.	China Science and Technology Network	6	4	66.7%	2	33.3%
16.	Hangzhou Alibaba Advertising Co	13	9	69.2%	4	30.8%
17.	Tianjin University IPv6 Campus Network	6	5	83.3%	1	16.7%

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 (Aug 2023)

	ISP	Test count	IPv6 average
1.	Tianjin University IPv6 Campus Network	6	74.3 Mbps
2.	China Mobile communications corporation	472	60.3 Mbps
3.	China Unicom Network	1,238	26.6 Mbps
4.	China Mobile	1,056	20.0 Mbps
5.	Cernet	15	9.1 Mbps
6.	Chinanet	1,447	7.8 Mbps
7.	China Telecom	196	0.6 Mbps
8.	China Science and Technology Network	6	0.3 Mbps
9.	China Internet Network Information Center	21	0.0 Mbps
10.	Computer Network Information Center	5	0.0 Mbps
11.	Beijing Baidu Netcom Science and Technology Co., Ltd.	9	0.0 Mbps
12.	Cloudflare, Inc.	74	0.0 Mbps
13.	Shenzhen Tencent Computer Systems Company Limited	6	0.0 Mbps
14.	China Next Generation Internet CERNET2	18	0.0 Mbps
15.	Hangzhou Alibaba Advertising Co	13	0.0 Mbps
16.	Cngi-cernet2	72	0.0 Mbps
17.	CERNET2 IX at Huazhong University of Science and Technology	8	0.0 Mbps

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