Java tutorial
//package com.java2s; import java.net.InetAddress; import java.net.UnknownHostException; import android.util.Log; public class Main { private static String Tag = "Helper"; public static String getHostName(String ip) { String hostName = "Unknown"; try { InetAddress add = InetAddress.getByName(ip); hostName = add.getHostName(); Log.d(Tag, "host name is " + hostName); } catch (UnknownHostException e) { // TODO Auto-generated catch block e.printStackTrace(); } return hostName; } }