Java InetAddress class

What is the uses of InetAddress class?

  • Addresses are fundamental in Internet.
  • InetAddress class is used to encapsulate both the IP address and domain name for that address.
  • InetAddress can handle both IPV4 and IPV6 addresses.

How to get IP address for local machine or any host name?

InetAddress Factory methods are
//Returns the IP address of Local machine.
static InetAddress.getLocalHost() throws UnknownHostException

//Returns IP address of given host name
static InetAddress.getByName(String host) throws UnknownHostException

//Returns an array of IP addresses of particular host name.
static InetAddress.getAllByName(String host) throws UnknownHostException

static InetAddress.getByAddress(byte addr[]) throws UnknownHostException
To get address of local machine
import java.net.*;                                                              
                                                                                
class InetAddressDemo {                                                         
                                                                                
 public static void main(String args[]) throws UnknownHostException {           
  InetAddress address = InetAddress.getLocalHost();                             
  System.out.println(address);                                                  
 }                                                                              
                                                                                
} 

To get address from host name.
import java.net.*;                                                              
                                                                                
class InetAddressDemo {                                                         
                                                                                
 public static void main(String args[]) throws UnknownHostException {           
  InetAddress address = InetAddress.getByName("www.google.com");                
  System.out.println(address);                                                  
 }                                                                              
                                                                                
} 
To get array of host address associated to domain name.

import java.net.*;                                                              
                                                                                
class InetAddressDemo {                                                         
                                                                                
 public static void main(String args[]) throws UnknownHostException {           
  InetAddress address[] = InetAddress.getAllByName("www.google.com");           
  for(int i=0; i<address.length; i++)                                           
   System.out.println(address[i]);                                              
 }                                                                              
                                                                                
} 
import java.net.*;                                                              
                                                                                
class InetAddressDemo {                                                         
                                                                                
 public static void main(String args[]) throws UnknownHostException {           
  byte[] ipAddr = new byte[] {(byte)172,(byte)217,(byte)26,(byte)196};          
  InetAddress address = InetAddress.getByAddress(ipAddr);                                                              
  System.out.println(address);                                                  
 }                                                                              
                                                                                
}  

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