Studenten Net Twente at the University of Twente host an Ookla Speedtest Server which can be used via speedtest.net and has a 10Gbps connection.
SNT also host test files on the mirror server which also has a 10Gbps connection. These files van be reached via ftp and http
Both servers work via IPv4 and IPv6. Although the Ookla Speedtest website shows your IPv4 address the actual test with our server can use IPv6.