Czech Republic IPv6 in Czech Republic

These 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.

Overall IPv6 and v4 protocol support in Czech Republic

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 Czech Republic (Nov 2019)

  ISP IPv6 tests count
1.Telefonica O2 Cz269
2.Hurricane Electric LLC195
3.T-Mobile Czech Republic a.s.110
4.UVT Internet94
5.Upc Czech64
6.Core-Backbone51
7.Cesnet6-tcz49
8.Master 1-mai40
9.SMART Comp. a.s.37
10.brumovice.net36
11.Internet Cz25
12.Avonet25
13.Ktct23
14.Metronet22
15.Core4Net, s.r.o.21
16.P4ISP z.s.p.o. network19
17.Starnet s.r.o.15
18.Suntel Net s.r.o.14
19.Neutral Free eXchange members - FreeTel alternate14
20.KKNETroute14
21.PODA a.s.12
22.M247 Ltd12
23.Boknet9
24.GTTs9
25.Vutbr69

IPv6 and v4 protocol support in Czech Republic (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 Czech Republic (unique addresses, Nov 2019)

  ISP Unique IPv6 addresses
1.Telefonica O2 Cz132
2.Hurricane Electric LLC97
3.Upc Czech45
4.T-Mobile Czech Republic a.s.41
5.UVT Internet27
6.brumovice.net26
7.Cesnet6-tcz25
8.SMART Comp. a.s.24
9.Avonet23
10.Core4Net, s.r.o.14
11.Starnet s.r.o.13
12.Core-Backbone11
13.PODA a.s.11
14.Suntel Net s.r.o.11
15.Ktct8
16.Internet Cz8
17.RPSv67
18.P4ISP z.s.p.o. network6
19.Metronet6
20.M247 Ltd5
21.Vutbr65
22.Neutral Free eXchange members - FreeTel alternate5
23.Boknet4
24.Sys-datacom I4
25.Grapesc I3

Default browser protocol in Czech Republic

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 Czech Republic (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 Czech Republic (Nov 2019)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.PODA a.s.1200.0%12100.0%
2.Metronet2200.0%22100.0%
3.Master 1-mai4000.0%40100.0%
4.Grapesc I500.0%5100.0%
5.Core4Net, s.r.o.2100.0%21100.0%
6.brumovice.net3600.0%36100.0%
7.UVT Internet9433.2%9196.8%
8.P4ISP z.s.p.o. network1915.3%1894.7%
9.Starnet s.r.o.1516.7%1493.3%
10.Cesnet6-tcz4948.2%4591.8%
11.Telefonica O2 Cz269228.2%24791.8%
12.Upc Czech64710.9%5789.1%
13.RPSv69111.1%888.9%
14.Vutbr69111.1%888.9%
15.Sys-datacom I9111.1%888.9%
16.Internet Cz25416.0%2184.0%
17.Hurricane Electric LLC1953719.0%15881.0%
18.GIN's network5120.0%480.0%
19.T-Mobile Czech Republic a.s.1102522.7%8577.3%
20.Suntel Net s.r.o.14428.6%1071.4%
21.SMART Comp. a.s.371232.4%2567.6%
22.Avonet25936.0%1664.0%
23.M247 Ltd12541.7%758.3%
24.Coma5480.0%120.0%
25.Neutral Free eXchange members - FreeTel alternate1414100.0%00.0%

IPv6 address types in Czech Republic

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 Czech Republic

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 Czech Republic (Nov 2019)

  ISP Test count IPv6 average
1.Vutbr6982.6 Mbps
2.PODA a.s.1282.4 Mbps
3.Cesnet6-tcz4981.4 Mbps
4.Metronet2281.0 Mbps
5.Suntel Net s.r.o.1480.8 Mbps
6.KKNETroute1456.0 Mbps
7.UVT Internet9454.3 Mbps
8.Upc Czech6442.8 Mbps
9.Hurricane Electric LLC19539.4 Mbps
10.Master 1-mai4029.4 Mbps
11.SMART Comp. a.s.3729.4 Mbps
12.T-Mobile Czech Republic a.s.11022.3 Mbps
13.Telefonica O2 Cz26920.9 Mbps
14.Core-Backbone5114.1 Mbps
15.Internet Cz2513.4 Mbps
16.RPSv6911.6 Mbps
17.Boknet96.6 Mbps
18.Starnet s.r.o.156.5 Mbps
19.GIN's network50.0 Mbps
20.Coma50.0 Mbps
21.M247 Ltd120.0 Mbps
22.Avonet250.0 Mbps
23.Grapesc I50.0 Mbps
24.Ktct230.0 Mbps
25.Core4Net, s.r.o.210.0 Mbps