code: func checkInternalIP(ip net.IP) bool {
  	var privIPSpace []net.IPNet
  	// 10.0.0.0/8
  	privIPSpace = append(privIPSpace, net.IPNet{
  		IP:   net.IP{0xa, 0x0, 0x0, 0x0},
  		Mask: net.IPMask{0xff, 0x0, 0x0, 0x0},
  	})
  	// 172.16.0.0/12"
  	privIPSpace = append(privIPSpace, net.IPNet{
  		IP:   net.IP{0xac, 0x10, 0x0, 0x0},
  		Mask: net.IPMask{0xff, 0xf0, 0x0, 0x0},
  	})
  	// 192.168.0.0/16
  	privIPSpace = append(privIPSpace, net.IPNet{
  		IP:   net.IP{0xc0, 0xa8, 0x0, 0x0},
  		Mask: net.IPMask{0xff, 0xff, 0x0, 0x0},
  	})
  
  	for _, ipSpace := range privIPSpace {
  		if ipSpace.Contains(ip) {
  			return true
  		}
  	}
  	return false
  }
docs: // checkInternalIP verifies is an IP address in a registered internal range.
  // TODO: Check if we need to verify any IPv6 ranges
  // TODO: We should also check for special purpose IP ranges, we might want to do that in a specific function