code: public function isBlacklisted($host)
      {
          if (ip2long($host) === false) {
              $addr = gethostbyname($host);
  
              if ($addr == $host) {
                  throw new Ts3Exception("unable to resolve IPv4 address (" . $host . ")");
              }
  
              $host = $addr;
          }
  
          $this->getTransport()->send("ip4:" . $host);
          $repl = $this->getTransport()->read(1);
          $this->getTransport()->disconnect();
  
          if (!count($repl)) {
              return false;
          }
  
          return ($repl->toInt()) ? false : true;
      }
docs: Returns TRUE if a specified $host IP address is currently blacklisted.
  
  @param  string $host
  @throws Ts3Exception
  @return boolean