Creates a resolved {@link InetSocketAddress} when your hostname is actually an IP address.

ResolvedSocketAddress.java

    /**
     * Convert an IP in text format to its binary format.
     *
     * @param textIP literal IP
     * @return byte array or null if failed.
     */
    private byte[] getAddress(String textIP) {
        if (IPAddressUtil.isIPv4LiteralAddress(textIP)) {
            return IPAddressUtil.textToNumericFormatV4(textIP);
        } else if (IPAddressUtil.isIPv6LiteralAddress(textIP)) {
            return IPAddressUtil.textToNumericFormatV6(textIP);
        }
        return null;
    }

    /**
     * Creates a resolved {@link InetSocketAddress} when your hostname is actually an IP address.
     * We try to avoid Reverse DNS lookup when you make a call like {@link java.net.InetSocketAddress#getHostName()}.
     *
     * @param hostname a literal IP actually.
     * @param port     port number
     * @return an {@link InetSocketAddress} with both hostname and address are same as hostname in different formats..
     */
    public InetSocketAddress createResolved(String hostname, int port) {
        if (null == hostname) {
            throw new NullPointerException("Required hostname is null");
        }
        byte[] addr = getAddress(hostname);
        if (null == addr) {
            throw new NullPointerException("Converting hostname (" + hostname + ") to ip address got null.");
        }
        try {
            InetAddress address = InetAddress.getByAddress(hostname, addr);
            return new InetSocketAddress(address, port);
        } catch (UnknownHostException e) {
            // This should never happen when your hostname is a valid IP.
            throw new IllegalArgumentException("Invalid hostname " + hostname, e);
        }
    }