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 (Sep 2023)

  ISP IPv6 tests count
1.O2 Czech Republic81
2.STARNET, s.r.o.40
3.T-Mobile Czech Republic a.s.39
4.AVONET, s.r.o.38
5.METRONET s.r.o.33
6.Hurricane Electric LLC32
7.Vodafone Czech Republic a.s.27
8.brumovice.net18
9.Nej.cz s.r.o.17
10.SpaceX Starlink14
11.O2 Czech Republic, a.s.9
12.Pe3ny Net s.r.o.8
13.Poda8
14.Net85c07
15.Cesnet6-tcz7
16.Pe3ny Net s.r.o6
17.Core4Net, s.r.o.5

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, Sep 2023)

  ISP Unique IPv6 addresses
1.O2 Czech Republic46
2.T-Mobile Czech Republic a.s.25
3.Hurricane Electric LLC24
4.METRONET s.r.o.23
5.Vodafone Czech Republic a.s.20
6.STARNET, s.r.o.19
7.AVONET, s.r.o.17
8.brumovice.net14
9.Nej.cz s.r.o.11
10.SpaceX Starlink9
11.Cesnet6-tcz6
12.Net85c05
13.O2 Czech Republic, a.s.5
14.Pe3ny Net s.r.o.4
15.Core4Net, s.r.o.4
16.Poda4
17.Pe3ny Net s.r.o2

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.

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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 (Sep 2023)

  ISP Test count IPv4 IPv4 % IPv6 IPv6 %
1.AVONET, s.r.o.38821.1%3078.9%
2.Pe3ny Net s.r.o.8225.0%675.0%
3.O2 Czech Republic, a.s.9333.3%666.7%
4.Pe3ny Net s.r.o6233.3%466.7%
5.T-Mobile Czech Republic a.s.391435.9%2564.1%
6.METRONET s.r.o.331236.4%2163.6%
7.O2 Czech Republic813037.0%5163.0%
8.Hurricane Electric LLC321237.5%2062.5%
9.Core4Net, s.r.o.5240.0%360.0%
10.SpaceX Starlink14642.9%857.1%
11.Cesnet6-tcz7342.9%457.1%
12.brumovice.net18844.4%1055.6%
13.STARNET, s.r.o.401845.0%2255.0%
14.Net85c07457.1%342.9%
15.Nej.cz s.r.o.171058.8%741.2%
16.Poda8562.5%337.5%
17.Vodafone Czech Republic a.s.271763.0%1037.0%

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 (Sep 2023)

  ISP Test count IPv6 average
1.T-Mobile Czech Republic a.s.39112.2 Mbps
2.O2 Czech Republic8169.2 Mbps
3.Nej.cz s.r.o.1721.1 Mbps
4.STARNET, s.r.o.4017.1 Mbps
5.Hurricane Electric LLC3213.6 Mbps
6.O2 Czech Republic, a.s.90.0 Mbps
7.Vodafone Czech Republic a.s.270.0 Mbps
8.Pe3ny Net s.r.o.80.0 Mbps
9.Net85c070.0 Mbps
10.SpaceX Starlink140.0 Mbps
11.brumovice.net180.0 Mbps
12.METRONET s.r.o.330.0 Mbps
13.Core4Net, s.r.o.50.0 Mbps
14.Cesnet6-tcz70.0 Mbps
15.Pe3ny Net s.r.o60.0 Mbps
16.Poda80.0 Mbps
17.AVONET, s.r.o.380.0 Mbps
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