You are connected from 18.104.22.168 using IPv4.
To enforce usage of IPv6 go to speedtest6.ownit.se.
This speedtest server is running on FreeBSD, has 2x1Gbps linkspeed and is connected to Ownits backbone in Stockholm, Sweden.
The files served are "sparse files" which means server hardware performance is not a factor and also they do not take up any diskspace.
There is an iperf daemon running on this server. Iperf is also available for Windows