Java InetAddress getByName() method

The getByName() method of InetAddress class determines the IP address of a host from the given host's name.

If the host name is null, then an InetAddress representing an address of the loopback interface is returned.

Syntax:

Parameters:

host - the specified host, or null.

Returns

The getByName() method returns an IP address for the given host name.

Throws

UnknownHostException: if no IP address for the host could be found, or if a scope_id was specified for a global IPv6 address.

SecurityException: if a security manager exists and its checkConnect method doesn?t allow the operation.

Example 1

import java.net.InetAddress;
public class JavaInetAddressGetByAddressExample1_1 {
  public static void main(String[] args) {
    try {
      InetAddress ia = InetAddress.getByName("46.21.29.40");
      System.out.println(ia.getHostName());
    } catch (Exception ex) {
      System.err.println(ex);
    }
  }
}

Test it Now

Output:

46.21.29.40

Example 2

import java.net.InetAddress;
public class JavaInetAddressGetByAddressExample1_2 {
    public static void main(String[] args) {
        try {
           // passing null value
            InetAddress ia = InetAddress.getByName(null);
            System.out.println(ia);
        } catch (Exception ex) {
            System.err.println(ex);
        }

    }
}

Test it Now

Output: