210.251.0.0/16 covers 210.251.0.0 to 210.251.255.255, 65,536 IPv4 addresses. It is announced by AS2516 (KDDI Corporation) and 3 other networks. Every sampled address geolocates to Japan, with 72% in Tokyo. 63% of it is registered to an internet service provider. None of the sampled addresses are flagged as VPN, proxy or Tor.