@Nullable
    public static Protocol parse(int number) {
        for (Protocol protocol : values()) {
            if (protocol.number == number) {
                return protocol;
            }
        }
        return null;
    }
Parse the protocol by number.

@param number Protocol number.
@return The supported protocol number or null.
netbare-core/src/main/java/com/github/megatronking/netbare/ip/Protocol.java