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 2023)

	ISP	IPv6 tests count
1.	Chinanet	1,582
2.	China Unicom Network	1,118
3.	China Mobile	914
4.	China Mobile communications corporation	456
5.	China Telecom	274
6.	Cngi-cernet2	125
7.	Computer Network Information Center	93
8.	China Next Generation Internet CERNET2	71
9.	Cloudflare, Inc.	69
10.	Cernet	37
11.	China Internet Network Information Center	25
12.	Tsinghua University	12
13.	DigitalOcean, LLC	12
14.	China Science and Technology Network	11
15.	Shenzhen Tencent Computer Systems Company Limited	10
16.	CERNET2 IX at Huazhong University of Science and Technology	9
17.	Hangzhou Alibaba Advertising Co	6
18.	CERNET2 IX at Shanghai Jiaotong University	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 2023)

	ISP	Unique IPv6 addresses
1.	Chinanet	1,147
2.	China Unicom Network	838
3.	China Mobile	731
4.	China Mobile communications corporation	349
5.	China Telecom	197
6.	Cngi-cernet2	107
7.	Computer Network Information Center	71
8.	Cloudflare, Inc.	66
9.	China Next Generation Internet CERNET2	53
10.	Cernet	31
11.	China Internet Network Information Center	18
12.	China Science and Technology Network	11
13.	Tsinghua University	10
14.	Shenzhen Tencent Computer Systems Company Limited	8
15.	CERNET2 IX at Huazhong University of Science and Technology	6
16.	Hangzhou Alibaba Advertising Co	5
17.	CERNET2 IX at Shanghai Jiaotong University	4
18.	DigitalOcean, LLC	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 (Sep 2023)

	ISP	Test count	IPv4	IPv4 %	IPv6	IPv6 %
1.	DigitalOcean, LLC	12	2	16.7%	10	83.3%
2.	Cloudflare, Inc.	69	21	30.4%	48	69.6%
3.	China Internet Network Information Center	25	9	36.0%	16	64.0%
4.	CERNET2 IX at Shanghai Jiaotong University	5	2	40.0%	3	60.0%
5.	Shenzhen Tencent Computer Systems Company Limited	10	4	40.0%	6	60.0%
6.	China Mobile	914	376	41.1%	538	58.9%
7.	China Mobile communications corporation	456	191	41.9%	265	58.1%
8.	Computer Network Information Center	93	40	43.0%	53	57.0%
9.	CERNET2 IX at Huazhong University of Science and Technology	9	4	44.4%	5	55.6%
10.	China Unicom Network	1,118	503	45.0%	615	55.0%
11.	China Telecom	274	127	46.4%	147	53.6%
12.	Chinanet	1,582	777	49.1%	805	50.9%
13.	Cngi-cernet2	125	67	53.6%	58	46.4%
14.	Cernet	37	20	54.1%	17	45.9%
15.	China Next Generation Internet CERNET2	71	41	57.7%	30	42.3%
16.	Hangzhou Alibaba Advertising Co	6	4	66.7%	2	33.3%
17.	China Science and Technology Network	11	8	72.7%	3	27.3%
18.	Tsinghua University	12	10	83.3%	2	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 (Sep 2023)

	ISP	Test count	IPv6 average
1.	Cloudflare, Inc.	69	95.1 Mbps
2.	China Mobile communications corporation	456	40.8 Mbps
3.	China Telecom	274	31.6 Mbps
4.	Cngi-cernet2	125	28.3 Mbps
5.	China Unicom Network	1,118	23.1 Mbps
6.	China Mobile	914	13.7 Mbps
7.	China Next Generation Internet CERNET2	71	10.7 Mbps
8.	Chinanet	1,582	9.7 Mbps
9.	Computer Network Information Center	93	0.5 Mbps
10.	China Science and Technology Network	11	0.3 Mbps
11.	Cernet	37	0.1 Mbps
12.	China Internet Network Information Center	25	0.0 Mbps
13.	Tsinghua University	12	0.0 Mbps
14.	CERNET2 IX at Huazhong University of Science and Technology	9	0.0 Mbps
15.	Hangzhou Alibaba Advertising Co	6	0.0 Mbps
16.	Shenzhen Tencent Computer Systems Company Limited	10	0.0 Mbps
17.	CERNET2 IX at Shanghai Jiaotong University	5	0.0 Mbps
18.	DigitalOcean, LLC	12	0.0 Mbps

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