Ha.. my ISP does :) I can hit those 25Gb/s when connecting directly (bypassing the router as it barely handles those 25Gb/s).

With it in the way I get ~15-20Gb/s

  $ iperf3 -l 1M --window 64M -P10 -c speedtest.init7.net
  ..
  [SUM]   0.00-1.00   sec  1.87 GBytes  16.0 Gbits/sec  181406

  $ iperf3 -R -l 1M --window 64M -P10 -c speedtest.init7.net
  ..
  [SUM]   0.00-1.00   sec  2.29 GBytes  19.6 Gbits/sec

Well there are some public iperf servers listed here: https://iperf.fr/iperf-servers.php

https://github.com/R0GGER/public-iperf3-servers is also a good list - a couple more US servers in various datacenters