Get canonical host name : Internet Addresses « Network « Java Tutorial

1. Java Tutorial
2. Network
3. Internet Addresses

import java.net.InetAddress;

public class Main {
  public static void main(String[] argv) throws Exception {
    byte[] ipAddr = new byte[] { 127, 0, 0, 1 };
    InetAddress addr = InetAddress.getByAddress(ipAddr);
    String hostnameCanonical = addr.getCanonicalHostName();
  }
}