root@z800-VirtualBox:~# apt install speedtest-cli
root@z800-VirtualBox:~# speedtest --list | grep Japan
6368) gatolabo (Maibara, Japan) [57.87 km]
6766) JAIST(ino-lab) (Nomi, Japan) [91.03 km]
24774) Local24 Inc., (Kyoto, Japan) [115.67 km]
6087) Allied Telesis Capital Corporation (Fussa-shi, Japan) [230.52 km]
8407) Allied Telesis Capital Corporation (Sagamihara, Japan) [234.26 km]
24537) ymsr.cloud (Yamato, Japan) [242.52 km]
15047) OPEN Project (via 20G SINET) (Tokyo, Japan) [262.03 km]
24333) Rakuten Mobile , Inc (Tokyo, Japan) [262.03 km]
28910) fdcservers.net (Tokyo, Japan) [262.03 km]
21569) i3D.net (Tokyo, Japan) [262.03 km]
18516) GIAM PING VIETPN.COM (Tokyo, Japan) [262.03 km]
14623) IPA CyberLab (Bunkyo, Japan) [268.27 km]
7139) SoftEther Corporation (Tsukuba, Japan) [299.16 km]
18709) extride inc (Hitoyoshi, Japan) [673.66 km]
6405) Allied Telesis Capital Corporation (Misawa, Japan) [688.93 km]
6581) haza (Haebaru, Japan) [1358.79 km]
21118) GLBB Japan (Naha, Japan) [1359.91 km]
root@z800-VirtualBox:~# speedtest --server 15047
Retrieving speedtest.net configuration...
Testing from Asahi Net (203.181.3.94)...
Retrieving speedtest.net server list...
Retrieving information for the selected server...
Hosted by OPEN Project (via 20G SINET) (Tokyo) [262.03 km]: 21.663 ms
Testing download speed................................................................................
Download: 89.99 Mbit/s
Testing upload speed......................................................................................................
Upload: 3.99 Mbit/s