public void testIncrementIPv6() throws UnknownHostException {
    InetAddress addressV6_66_0 = InetAddress.getByName("2001:db8::6600");
    InetAddress addressV6_66_ff = InetAddress.getByName("2001:db8::66ff");
    InetAddress addressV6_67_0 = InetAddress.getByName("2001:db8::6700");

    InetAddress address = addressV6_66_0;
    for (int i = 0; i < 255; i++) {
      address = InetAddresses.increment(address);

 */
package okhttp3

import assertk.assertThat
import assertk.assertions.containsExactly
import java.net.InetAddress
import java.net.UnknownHostException
import java.util.Collections
import okio.Buffer

class FakeDns : Dns {
  private val hostAddresses: MutableMap<String, List<InetAddress>> =
    Collections.synchronizedMap(mutableMapOf())

   *
   * @param address the InetAddress to decrement
   * @return a new InetAddress that is one less than the passed in address
   * @throws IllegalArgumentException if InetAddress is at the beginning of its range
   * @since 18.0
   */
  public static InetAddress decrement(InetAddress address) {
    byte[] addr = address.getAddress();
    int i = addr.length - 1;
    while (i >= 0 && addr[i] == (byte) 0x00) {

            final String ipv6Address = host.substring(1, host.length() - 1);
            return InetAddress.getAllByName(ipv6Address);
        }
        return InetAddress.getAllByName(toAscii(host));
    }

    /**
     * Returns the canonical host name for the given host.
     * This method returns the host name obtained from the address.
     *
     * @param host the host name to resolve

          when {
            domainName.equals(HOSTNAME_THAT_ONLY_THE_PROXY_KNOWS, ignoreCase = true) -> {
              InetAddress.getByName("localhost")
            }

            else -> {
              InetAddress.getByName(domainName)
            }
          }
        }

        else -> {
          throw ProtocolException("unsupported address type: $addressType")

   */
  @Throws(IOException::class)
  public fun start(
    inetAddress: InetAddress,
    port: Int,
  ) {
    start(InetSocketAddress(inetAddress, port))
  }

  /**
   * Starts the server and binds to the given socket address.
   *
   * @param socketAddress the socket address to bind the server on
   */
  @Synchronized
  @Throws(IOException::class)

    printEvent("callEnd");
  }

  @Override public void dnsStart(Call call, String domainName) {
    printEvent("dnsStart");
  }

  @Override public void dnsEnd(Call call, String domainName, List<InetAddress> inetAddressList) {
    printEvent("dnsEnd");
  }

  ...
}
```

We make a couple calls:

```java
Request request = new Request.Builder()
    .url("https://publicobject.com/helloworld.txt")

     *
     * @return formatted string containing hostname and IP address
     */
    protected String getHostInfo() {
        final StringBuilder buf = new StringBuilder();
        try {
            final InetAddress ia = InetAddress.getLocalHost();
            final String hostname = ia.getHostName();
            if (StringUtil.isNotBlank(hostname)) {
                buf.append(hostname);
            }

    }

    /**
     * Resolves a hostname to an InetAddress.
     *
     * @param host the hostname to resolve
     * @return the resolved InetAddress
     * @throws FessSystemException if hostname resolution fails
     */
    protected InetAddress getInetAddressByName(final String host) {
        try {
            return InetAddress.getByName(host);
        } catch (final UnknownHostException e) {

 * limitations under the License.
 */

package okhttp3

import java.io.File
import java.io.IOException
import java.math.BigInteger
import java.net.CookieHandler
import java.net.InetAddress
import java.net.InetSocketAddress
import java.net.Proxy
import java.net.ProxySelector
import java.net.Socket
import java.net.URI
import java.net.URL
import java.nio.charset.Charset
import java.security.KeyPair