iperf3 speed-test endpoint  (host iperf3.vps.ivanthegeek.com, TCP/UDP 5201, open to any network)

  download:  iperf3 -c iperf3.vps.ivanthegeek.com -R -P 8
  upload:    iperf3 -c iperf3.vps.ivanthegeek.com -P 8
  udp:       iperf3 -c iperf3.vps.ivanthegeek.com -u -b 0 -P 4

web test:    https://librespeed.vps.ivanthegeek.com