How can I test the speed of my internet connection?

To perform a speed test, proceed as follows:

  1. Disconnect your router from the power supply for five minutes before the speed test.
  2. Disconnect all devices from the router and use the Ethernet cable to connect your computer/laptop directly to the router (PLEASE NOTE: WLAN speed tests are not permissible for measurements).
  3. Restart your computer/laptop and download the Ookla app.
  4. Call up the Init7 speed test server or conduct an Iperf3 test (see nerd mode).
  5. Carry out three measurements.

If the speed values are still unsatisfactory even after these factors have been taken into consideration, contact our Fiber7 support team.

Please include three links of the speed test results (example) along with your enquiry as well as a list of the hardware you are using (from the end device to the OTO socket) so that we can carry out our troubleshooting with precision.


Fiber7 has a nominal speed of respectively 1, 10 and 25 Gbit/s (gigabits per second). This does not necessarily mean 1000, 10000 and 25000 Mbit/sec (megabits per second), however. Under ideal conditions, the maximum possible speed is 940, 9400 and 23500 Mbit/sec (the Ethernet throughput limit).

Countless factors can affect speed negatively. Experience has shown that 99% of all complaints are due to problematic configurations or the user’s own applications. Before you contact our support team, please note the following:

WLAN speed tests cannot be accepted. Valid speed tests must be performed with an 8-pin Ethernet cable. Required Ethernet cable standards:

  • Fiber7 1 Gbit/s at least Cat 5e
  • Fiber7 10 Gbit/s: at least Cat 6
  • Fiber7 25 Gbit/s: at least Cat 8 sometimes suggests unfavourable test servers. Please use only our speed test server (Speedtest-Server).

The firewall activated by default in Windows 10 causes massive slowing. Please disable the firewall before performing the speed test (the same applies to older versions of Windows).

Iperf3 offers an alternative possibility for a speed test:

$ sudo apt-get install iperf3
$ iperf3 -c

iperf3 can be extended by further parameters. -4 resp. -6 specifies whether the test is performed via IPv4 resp. IPv6. -R reverses the test direction. Further options via iperf3 --help