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 (May 2017)

	ISP	IPv6 tests count
1.	Cngi-cernet2	2,812
2.	Zparknet	1,804
3.	Hurricane Electric	1,247
4.	Cernet	638
5.	Hust6-cernet	630
6.	Cernet2-tsinghua6	616
7.	Zsu6-cernet	479
8.	Buaa6-cernet2	373
9.	Cernet2-tju6	318
10.	Xidian6-cernet	299
11.	CT Networks	297
12.	Cstnet-cnnic	246
13.	Dlut6-cernet2	237
14.	Szu6-cernet	172
15.	Whu6-cernet	163
16.	Pku6-cernet2	156
17.	China Unicom	107
18.	CTM Internet Service	105
19.	Apnic Portables8	100
20.	Chinanet-gd	98
21.	Neu6-cernet2	94
22.	Cernet2-sjtu6	84
23.	China Unicom Beijing Province Network	83
24.	Szuc6-cernet	80
25.	Sjtu6-cernet2	76

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, May 2017)

	ISP	Unique IPv6 addresses
1.	Cngi-cernet2	1,792
2.	Hurricane Electric	771
3.	Zparknet	545
4.	Cernet2-tsinghua6	381
5.	Cernet	375
6.	Buaa6-cernet2	262
7.	Hust6-cernet	260
8.	Zsu6-cernet	246
9.	Cernet2-tju6	243
10.	CT Networks	175
11.	Cstnet-cnnic	153
12.	Xidian6-cernet	142
13.	Dlut6-cernet2	105
14.	Pku6-cernet2	104
15.	Whu6-cernet	91
16.	Szu6-cernet	81
17.	CTM Internet Service	76
18.	Chinanet-gd	75
19.	Neu6-cernet2	65
20.	Cernet2-sjtu6	60
21.	China Unicom	55
22.	China Unicom Beijing Province Network	55
23.	Nankai6-cernet	47
24.	Sdu6-cernet2	47
25.	Cstnet	47

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 (May 2017)

	ISP	Test count	IPv4	IPv4 %	IPv6	IPv6 %
1.	Pbsl	5	0	0.0%	5	100.0%
2.	Ahu6-cernet	15	0	0.0%	15	100.0%
3.	Scu6-cernet	32	0	0.0%	32	100.0%
4.	Swufe6-cernet	6	0	0.0%	6	100.0%
5.	Zzu6-cernet	6	0	0.0%	6	100.0%
6.	Zzu6-cernet2	35	1	2.9%	34	97.1%
7.	Apnic Portables8	100	3	3.0%	97	97.0%
8.	Zzgiant	52	3	5.8%	49	94.2%
9.	Cau6-cernet	32	2	6.3%	30	93.8%
10.	Ustc6-cernet2	30	2	6.7%	28	93.3%
11.	Hunu6-cernet	30	2	6.7%	28	93.3%
12.	Nankai6-cernet	72	5	6.9%	67	93.1%
13.	Jlu6-cernet2	53	4	7.5%	49	92.5%
14.	Ncust6-cernet	23	2	8.7%	21	91.3%
15.	Cer2bkb6-cernet2	11	1	9.1%	10	90.9%
16.	Tongji6-cernet2	32	3	9.4%	29	90.6%
17.	Chd6-cernet	7	1	14.3%	6	85.7%
18.	Szu6-cernet	172	25	14.5%	147	85.5%
19.	Sjtu6-cernet2	76	12	15.8%	64	84.2%
20.	Buct6-cernet	47	8	17.0%	39	83.0%
21.	Szuc6-cernet	80	14	17.5%	66	82.5%
22.	Sdu6-cernet2	57	10	17.5%	47	82.5%
23.	Nwpu6-cernet	61	11	18.0%	50	82.0%
24.	Uestc6-cernet2	11	2	18.2%	9	81.8%
25.	Buaa6-cernet2	373	69	18.5%	304	81.5%

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 (May 2017)

	ISP	Test count	IPv6 average
1.	Google Inc.	5	141.2 Mbps
2.	Cau6-cernet	32	27.7 Mbps
3.	Cernet2-ruc6	49	27.7 Mbps
4.	CTM Internet Service	105	24.3 Mbps
5.	American Registry Internet Numbers	6	19.8 Mbps
6.	Chinanet-fj	11	16.8 Mbps
7.	Cernet	638	11.2 Mbps
8.	Cernet2-sjtu6	84	10.1 Mbps
9.	Hurricane Electric	1,247	9.7 Mbps
10.	Xmu6-cernet2	34	9.1 Mbps
11.	Cumtb6-cernet	44	8.6 Mbps
12.	Hunu6-cernet	30	8.2 Mbps
13.	Cntcl	25	7.7 Mbps
14.	Jlu6-cernet2	53	7.6 Mbps
15.	Cngi-cernet2	2,812	7.3 Mbps
16.	Buaa6-cernet2	373	7.0 Mbps
17.	Cernet2-tju6	318	6.9 Mbps
18.	Cstnet-cnnic	246	6.9 Mbps
19.	Szu6-cernet	172	6.3 Mbps
20.	Tongji6-cernet2	32	6.2 Mbps
21.	Sdu6-cernet2	57	6.2 Mbps
22.	Sjtu6-cernet2	76	6.0 Mbps
23.	Szuc6-cernet	80	5.9 Mbps
24.	Pku6-cernet2	156	5.7 Mbps
25.	Dlut6-cernet2	237	5.2 Mbps