code: public String convertIPBackToString(long ip) {
          StringBuffer sb = new StringBuffer(16);
          sb.append(Long.toString((ip >> 24)& 0xFF));
          sb.append('.');
          sb.append(Long.toString((ip >> 16)& 0xFF));
          sb.append('.');
          sb.append(Long.toString((ip >> 8) & 0xFF));
          sb.append('.');
          sb.append(Long.toString(ip & 0xFF));
          return sb.toString();
      }
docs: converts a long to a dot delimited IP address string.