*
     * @param host the host name to resolve
     * @return the canonical host name
     * @throws UnknownHostException if the host name cannot be resolved
     */
    @Override
    public String resolveCanonicalHostname(final String host) throws UnknownHostException {
        final InetAddress[] addresses = resolve(host);
        if (addresses.length > 0) {
            return addresses[0].getCanonicalHostName();
        }