221.199.128.0/18 covers 221.199.128.0 to 221.199.191.255, 16,384 IPv4 addresses. It is announced by AS4837 (China Unicom). Every sampled address geolocates to China, with 25% in Hohhot. It is registered to an internet service provider. None of the sampled addresses are flagged as VPN, proxy or Tor.