21.246.0.0/16 covers 21.246.0.0 to 21.246.255.255, 65,536 IPv4 addresses. It is announced by AS749 (United States Department of Defense). Every sampled address geolocates to United States, with 97% in Columbus. It is registered to a government network. None of the sampled addresses are flagged as VPN, proxy or Tor.