function is_cookiebot_ip($ip) { // updated: 2025-04-28  
  // Convert IP string to number
  if (is_string($ip)) {
    $bytes = explode('.', $ip);
    $ip = 0;
    foreach ($bytes as $n) {
      $ip <<= 8;
      $ip |= (int)$n;
    }
  }
  // Check rules
  switch ($ip & 0b0_11111111_11111111_11111111_11111111) { // mask: 255.255.255.255
    case        0b0_00010100_11011111_00001001_10001010:   // ip:   20.223.9.138
    case        0b0_00100010_01101011_01100110_00101111:   // ip:   34.107.102.47
    case        0b0_00100010_10001101_00001010_00011000:   // ip:   34.141.10.24
    case        0b0_00100010_10011111_01010110_01111110:   // ip:   34.159.86.126
    case        0b0_00100010_10011111_10101000_11000011:   // ip:   34.159.168.195
    case        0b0_00100010_10011111_11110111_11011110:   // ip:   34.159.247.222
    case        0b0_00100011_11000110_01001110_11001111:   // ip:   35.198.78.207
    case        0b0_00100011_11000110_10001001_00000110:   // ip:   35.198.137.6
    case        0b0_00100011_11000110_10100000_00110001:   // ip:   35.198.160.49
    case        0b0_00100011_11110110_10001111_00000010:   // ip:   35.246.143.2
    case        0b0_00100011_11110110_10111111_00001110:   // ip:   35.246.191.14
      return true;
  }
  return false;
}