code: public static boolean isOui(String address) {
          if (ouiRegistry == null) {
              synchronized (AddressUtils.class) {
                  if (ouiRegistry == null) {
                      ouiRegistry = loadOuiRegistry();
                  }
              }
          }
          return ouiRegistry.contains(Integer.valueOf(address.replace(":", "").substring(0, 6), 16));
      }
docs: Checks whether the provided address is a Organizational Unique Identifier.
  This method uses internal registry of OUI that is built/updated every release cycle (see maven build).
  @param address Bluetooth address
  @return true if the provided address is a OUI, false otherwise