IPv6 in Czech RepublicThese graphs show the evolution of default protocol, v6 address types, and average bandwidth in Czech Republic 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. | Telefonica O2 Cz | 207 |
| 2. | Metronet | 134 |
| 3. | Hurricane Electric LLC | 128 |
| 4. | brumovice.net | 70 |
| 5. | Ceske Radiokomunikace | 60 |
| 6. | Upc Czech | 50 |
| 7. | Core-Backbone | 40 |
| 8. | Master | 40 |
| 9. | GIN's network | 29 |
| 10. | Avonet | 25 |
| 11. | T-Mobile Czech Republic a.s. | 25 |
| 12. | Cesnet6-tcz | 24 |
| 13. | SMART Comp. a.s. | 20 |
| 14. | Internet Cz | 20 |
| 15. | WEDOS Internet | 18 |
| 16. | UVT Internet | 18 |
| 17. | PODA a.s. | 17 |
| 18. | Sys-datacom I | 16 |
| 19. | Starnet s.r.o. | 14 |
| 20. | WIA spol. s r.o. | 12 |
| 21. | M247 Ltd | 9 |
| 22. | ELDATA prazska s.r.o. | 9 |
| 23. | Vutbr6 | 9 |
| 24. | GTTs | 9 |
| 25. | Core4Net, s.r.o. | 9 |
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. | Telefonica O2 Cz | 103 |
| 2. | Hurricane Electric LLC | 64 |
| 3. | brumovice.net | 51 |
| 4. | Ceske Radiokomunikace | 48 |
| 5. | Upc Czech | 34 |
| 6. | Avonet | 16 |
| 7. | T-Mobile Czech Republic a.s. | 14 |
| 8. | Cesnet6-tcz | 12 |
| 9. | GIN's network | 12 |
| 10. | SMART Comp. a.s. | 11 |
| 11. | Starnet s.r.o. | 11 |
| 12. | Core-Backbone | 11 |
| 13. | Internet Cz | 11 |
| 14. | Sys-datacom I | 10 |
| 15. | PODA a.s. | 10 |
| 16. | WIA spol. s r.o. | 8 |
| 17. | Vutbr6 | 8 |
| 18. | Metronet | 8 |
| 19. | UVT Internet | 7 |
| 20. | Core4Net, s.r.o. | 6 |
| 21. | Suntel Net s.r.o. | 5 |
| 22. | Network of Coolhousing | 5 |
| 23. | Ceska Telekomunikacni Infrastruktura a.s | 4 |
| 24. | M247 Ltd | 4 |
| 25. | ABAK network | 3 |
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. | Grapesc I | 5 | 0 | 0.0% | 5 | 100.0% |
| 2. | SychrovNET s.r.o | 9 | 0 | 0.0% | 9 | 100.0% |
| 3. | MetroHU | 5 | 0 | 0.0% | 5 | 100.0% |
| 4. | GIN's network | 29 | 0 | 0.0% | 29 | 100.0% |
| 5. | Metronet | 134 | 0 | 0.0% | 134 | 100.0% |
| 6. | Core4Net, s.r.o. | 9 | 0 | 0.0% | 9 | 100.0% |
| 7. | ABAK network | 6 | 0 | 0.0% | 6 | 100.0% |
| 8. | Ceska Telekomunikacni Infrastruktura a.s | 7 | 0 | 0.0% | 7 | 100.0% |
| 9. | Network of Coolhousing | 5 | 0 | 0.0% | 5 | 100.0% |
| 10. | UVT Internet | 18 | 0 | 0.0% | 18 | 100.0% |
| 11. | Avonet | 25 | 1 | 4.0% | 24 | 96.0% |
| 12. | brumovice.net | 70 | 3 | 4.3% | 67 | 95.7% |
| 13. | Upc Czech | 50 | 3 | 6.0% | 47 | 94.0% |
| 14. | T-Mobile Czech Republic a.s. | 25 | 2 | 8.0% | 23 | 92.0% |
| 15. | Cesnet6-tcz | 24 | 2 | 8.3% | 22 | 91.7% |
| 16. | PODA a.s. | 17 | 2 | 11.8% | 15 | 88.2% |
| 17. | Starnet s.r.o. | 14 | 2 | 14.3% | 12 | 85.7% |
| 18. | WIA spol. s r.o. | 12 | 2 | 16.7% | 10 | 83.3% |
| 19. | Telefonica O2 Cz | 207 | 35 | 16.9% | 172 | 83.1% |
| 20. | Hurricane Electric LLC | 128 | 24 | 18.8% | 104 | 81.3% |
| 21. | Vutbr6 | 9 | 2 | 22.2% | 7 | 77.8% |
| 22. | Master 1-mai | 7 | 2 | 28.6% | 5 | 71.4% |
| 23. | SMART Comp. a.s. | 20 | 7 | 35.0% | 13 | 65.0% |
| 24. | Ceske Radiokomunikace | 60 | 23 | 38.3% | 37 | 61.7% |
| 25. | WEDOS Internet | 18 | 7 | 38.9% | 11 | 61.1% |
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. | Metronet | 134 | 85.4 Mbps |
| 2. | Upc Czech | 50 | 76.6 Mbps |
| 3. | M247 Ltd | 9 | 69.7 Mbps |
| 4. | Grapesc I | 5 | 69.3 Mbps |
| 5. | Cesnet6-tcz | 24 | 66.0 Mbps |
| 6. | PODA a.s. | 17 | 45.9 Mbps |
| 7. | UVT Internet | 18 | 45.6 Mbps |
| 8. | Telefonica O2 Cz | 207 | 39.1 Mbps |
| 9. | Hurricane Electric LLC | 128 | 37.7 Mbps |
| 10. | Master 1-mai | 7 | 31.8 Mbps |
| 11. | Sys-datacom I | 16 | 29.4 Mbps |
| 12. | SMART Comp. a.s. | 20 | 26.3 Mbps |
| 13. | T-Mobile Czech Republic a.s. | 25 | 21.5 Mbps |
| 14. | Internet Cz | 20 | 20.3 Mbps |
| 15. | Starnet s.r.o. | 14 | 15.3 Mbps |
| 16. | Avonet | 25 | 15.0 Mbps |
| 17. | Network of Coolhousing | 5 | 12.9 Mbps |
| 18. | WIA spol. s r.o. | 12 | 10.1 Mbps |
| 19. | Ceske Radiokomunikace | 60 | 10.1 Mbps |
| 20. | ABAK network | 6 | 6.7 Mbps |
| 21. | GIN's network | 29 | 0.0 Mbps |
| 22. | SychrovNET s.r.o | 9 | 0.0 Mbps |
| 23. | Ceska Telekomunikacni Infrastruktura a.s | 7 | 0.0 Mbps |
| 24. | Core4Net, s.r.o. | 9 | 0.0 Mbps |
| 25. | brumovice.net | 70 | 0.0 Mbps |