IPv6 in ChinaThese 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.
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.
| ISP | IPv6 tests count | |
|---|---|---|
| 1. | Cngi-cernet2 | 3,966 |
| 2. | Zparknet | 1,342 |
| 3. | Hurricane Electric | 1,329 |
| 4. | Zsu6-cernet | 1,109 |
| 5. | Cernet | 889 |
| 6. | Cernet2-tsinghua6 | 818 |
| 7. | CT Networks | 747 |
| 8. | Pku6-cernet2 | 656 |
| 9. | Buaa6-cernet2 | 455 |
| 10. | Hust6-cernet | 438 |
| 11. | Cernet2-tju6 | 395 |
| 12. | China Unicom | 317 |
| 13. | Dlut6-cernet2 | 305 |
| 14. | Cstnet | 295 |
| 15. | Zzu6-cernet2 | 293 |
| 16. | Cstnet-cnnic | 276 |
| 17. | Lzu6-cernet2 | 269 |
| 18. | Chinanet-gd | 261 |
| 19. | China Mobile communications corporation | 261 |
| 20. | Nankai6-cernet | 229 |
| 21. | Xidian6-cernet | 178 |
| 22. | Szu6-cernet | 164 |
| 23. | China Unicom Beijing Province Network | 158 |
| 24. | Chinanet-sh | 154 |
| 25. | Cer2bkb6-cernet2 | 123 |
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.
| ISP | Unique IPv6 addresses | |
|---|---|---|
| 1. | Cngi-cernet2 | 2,698 |
| 2. | Hurricane Electric | 873 |
| 3. | Zsu6-cernet | 771 |
| 4. | Cernet | 613 |
| 5. | Cernet2-tsinghua6 | 530 |
| 6. | CT Networks | 505 |
| 7. | Zparknet | 498 |
| 8. | Pku6-cernet2 | 478 |
| 9. | Buaa6-cernet2 | 295 |
| 10. | Cernet2-tju6 | 279 |
| 11. | Zzu6-cernet2 | 221 |
| 12. | Cstnet-cnnic | 219 |
| 13. | Dlut6-cernet2 | 203 |
| 14. | China Unicom | 197 |
| 15. | Hust6-cernet | 196 |
| 16. | China Mobile communications corporation | 194 |
| 17. | Cstnet | 194 |
| 18. | Chinanet-gd | 189 |
| 19. | Lzu6-cernet2 | 168 |
| 20. | Nankai6-cernet | 158 |
| 21. | Xidian6-cernet | 121 |
| 22. | China Unicom Beijing Province Network | 114 |
| 23. | Szu6-cernet | 111 |
| 24. | Chinanet-sh | 93 |
| 25. | Chinanet-js | 77 |
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.
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.
| ISP | Test count | IPv4 | IPv4 % | IPv6 | IPv6 % | |
|---|---|---|---|---|---|---|
| 1. | University of Tsukuba, Sangaku Renkei Kenkyukai | 6 | 0 | 0.0% | 6 | 100.0% |
| 2. | Bupt6-cernet2 | 5 | 0 | 0.0% | 5 | 100.0% |
| 3. | SnapServ Ltd | 11 | 0 | 0.0% | 11 | 100.0% |
| 4. | Tyut6-cernet | 7 | 0 | 0.0% | 7 | 100.0% |
| 5. | Chd6-cernet | 8 | 0 | 0.0% | 8 | 100.0% |
| 6. | American Registry Internet Numbers | 18 | 0 | 0.0% | 18 | 100.0% |
| 7. | China Next Generation Internet CERNET2 | 10 | 0 | 0.0% | 10 | 100.0% |
| 8. | Jmu6-cernet | 22 | 1 | 4.5% | 21 | 95.5% |
| 9. | NetAssist | 74 | 5 | 6.8% | 69 | 93.2% |
| 10. | Zzgiant | 12 | 1 | 8.3% | 11 | 91.7% |
| 11. | Nstuaf6-cernet | 21 | 2 | 9.5% | 19 | 90.5% |
| 12. | Ihep | 10 | 1 | 10.0% | 9 | 90.0% |
| 13. | Hrbeu6-cernet | 104 | 11 | 10.6% | 93 | 89.4% |
| 14. | Wasuhz | 15 | 2 | 13.3% | 13 | 86.7% |
| 15. | Buct6-cernet | 37 | 5 | 13.5% | 32 | 86.5% |
| 16. | Cstnet | 295 | 41 | 13.9% | 254 | 86.1% |
| 17. | Ahu6-cernet | 50 | 7 | 14.0% | 43 | 86.0% |
| 18. | Neu6-cernet2 | 87 | 13 | 14.9% | 74 | 85.1% |
| 19. | Xjtu6-cernet | 99 | 15 | 15.2% | 84 | 84.8% |
| 20. | CERNET New Technology Co. | 45 | 7 | 15.6% | 38 | 84.4% |
| 21. | Tsinghua6-cernet2 | 45 | 7 | 15.6% | 38 | 84.4% |
| 22. | Xmu6-cernet2 | 24 | 4 | 16.7% | 20 | 83.3% |
| 23. | Pku6-cernet2 | 656 | 114 | 17.4% | 542 | 82.6% |
| 24. | Uestc6-cernet2 | 30 | 6 | 20.0% | 24 | 80.0% |
| 25. | Cernet2-tsinghua6 | 818 | 165 | 20.2% | 653 | 79.8% |
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.
| ISP | Test count | IPv6 average | |
|---|---|---|---|
| 1. | China Mobile communications corporation | 261 | 237.8 Mbps |
| 2. | NetAssist | 74 | 54.5 Mbps |
| 3. | Hurricane Electric | 1,329 | 38.5 Mbps |
| 4. | China Unicom Tianjin Province Network | 69 | 27.9 Mbps |
| 5. | China Unicom | 317 | 27.5 Mbps |
| 6. | Buaa6-cernet2 | 455 | 26.4 Mbps |
| 7. | Choopa | 9 | 24.1 Mbps |
| 8. | China Unicom Henan Province Network | 23 | 20.3 Mbps |
| 9. | CNC Group CHINA169 Tianjin Province Network | 66 | 19.6 Mbps |
| 10. | China Unicom CHINA169 Jiangsu Province Network | 32 | 16.5 Mbps |
| 11. | CNC Group CHINA169 Chongqing Province Network | 6 | 15.5 Mbps |
| 12. | CNC Group CHINA169 Zhejiang Province Network | 5 | 14.9 Mbps |
| 13. | Tsinghua6-cernet2 | 45 | 13.5 Mbps |
| 14. | CNC Group CHINA169 Henan Province Network | 67 | 11.7 Mbps |
| 15. | CNC Group CHINA169 Shandong Province Network | 80 | 9.7 Mbps |
| 16. | Chinanet-ah | 27 | 9.4 Mbps |
| 17. | China Unicom Chongqing Province Network | 6 | 8.7 Mbps |
| 18. | Fengniao | 16 | 7.8 Mbps |
| 19. | Ihep | 10 | 7.8 Mbps |
| 20. | Hust6-cernet | 438 | 7.4 Mbps |
| 21. | Chinanet-gd | 261 | 6.3 Mbps |
| 22. | Chinanet-sh | 154 | 5.0 Mbps |
| 23. | Pku6-cernet2 | 656 | 5.0 Mbps |
| 24. | Chinanet-hn | 20 | 4.9 Mbps |
| 25. | Cau6-cernet | 48 | 4.3 Mbps |