code: def _get_org(self, ipnum):
          
          seek_org = self._seek_country(ipnum)
          if seek_org == self._databaseSegments:
              return None
  
          read_length = (2 * self._recordLength - 1) * self._databaseSegments
          try:
              self._lock.acquire()
              self._fp.seek(seek_org + read_length, os.SEEK_SET)
              buf = self._fp.read(const.MAX_ORG_RECORD_LENGTH)
          finally:
              self._lock.release()
  
          if PY3 and type(buf) is bytes:
              buf = buf.decode(ENCODING)
  
          return buf[:buf.index(chr(0))]
docs: Seek and return organization or ISP name for ipnum.
          Return org/isp name.
  
          :arg ipnum: Result of ip2long conversion