InetAddress getHostName() in Java

getHostName(): This method is available in the java.net.InetAddress class of Java.

Syntax:

String java.net.InetAddress.getHostName()

This method gets the host name for this IP address.

If this InetAddress was created with a host name,this host name will be remembered and returned;otherwise, a reverse name lookup will be performed and the result will be returned based on the system configured name lookup service. If a lookup of the name service is required, call getCanonicalHostName.

Parameters: NA

Returns: the host name for this IP address, or if the operation is not allowed by the security check, the textual representation of the IP address.

Exceptions: NA

Approach

Java

package com.InetAddress;

import java.net.InetAddress;
import java.net.UnknownHostException;

public class InetAddressgetHostName {
    public static void main(String[] args) throws UnknownHostException {

        byte addr[] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 1, 2, 3, 4, 5, 6, 7 };
        InetAddress inetAddress = InetAddress.getByAddress(addr);

        System.out.println(inetAddress.getHostName());
    }
}

Output:

102:304:506:708:901:203:405:607

Some other methods of InetAddress class

equals(Object): This method compares this object against the specified object.

getAddress(): This method returns the raw IP address of this InetAddress object.

InetAddress.getAllByName(String host): This method returns an array of its IP addresses, based on the configured name service on the system.

InetAddress.getByAddress(byte[]): This method returns an InetAddress object given the raw IP address.

InetAddress.getByAddress(String, byte[]): This method creates an InetAddress based on the provided hostname and IP address.

InetAddress.getByName(String): This method determines the IP address of a host, given the host's name.

getCanonicalHostName(): This method gets the fully qualified domain name for this IP address.

getHostAddress(): This method returns the IP address string in textual presentation.

getHostName(): This method gets the hostname for this IP address.

InetAddress.getLocalHost(): This method returns the address of the local host. 

InetAddress.getLoopbackAddress(): This method returns the loopback address.

hashCode(): This method returns a hashcode for this IP address.

isAnyLocalAddress(): Utility routine to check if the InetAddress is a wildcard address.

isLinkLocalAddress(): Utility routine to check if the InetAddress is a link-local address.

isLoopbackAddress(): Utility routine to check if the InetAddress is a loopback address.

isMCGlobal(): Utility routine to check if the multicast address has global scope.

isMCLinkLocal(): Utility routine to check if the multicast address has link scope.

isMCNodeLocal(): Utility routine to check if the multicast address has node scope.

isMCOrgLocal(): Utility routine to check if the multicast address has organization scope.

isMCSiteLocal(): Utility routine to check if the multicast address has site scope.

isMulticastAddress(): Utility routine to check if the InetAddress is an IP multicast address.

isReachable(int): This method tests whether that address is reachable.

isReachable(NetworkInterface, int, int): This method tests whether that address is reachable.

isSiteLocalAddress(): Utility routine to check if the InetAddress is a site-local address.

toString(): This method converts this IP address to a String.