blocking all ips in a range

PHP

// The IP prefixes you want to block. Add a dot at the end.
$ip_block = ['47.79.'];

foreach ($ip_block as $ip_block_val) {
  // Check if the user's IP address begins with the blocked prefix.
  // strpos() will return 0 if it's found at the beginning of the string.
  if (strpos($_SERVER['REMOTE_ADDR'], $ip_block_val) === 0) {
    echo "Your IP range has been blocked.";
    return false;
  }
}