192.58.16.0/23 covers 192.58.16.0 to 192.58.17.255, 512 IPv4 addresses. It is announced by AS2907 (Research Organization of Information and Systems NII/SINET). Every sampled address geolocates to Japan, with 100% in Tokyo. It is registered to a business. None of the sampled addresses are flagged as VPN, proxy or Tor.