public static boolean isValidUnassignedAddress(final int address) {
        return isAddressInRange(address) && (address == UNASSIGNED_ADDRESS);
    }
Validates a unassigned address

@param address 16-bit address
@return true if the address is a valid unassigned address or false otherwise
mesh/src/main/java/no/nordicsemi/android/mesh/utils/MeshAddress.java