Java InetAddress getCanonicalHostName() method

The getCanonicalHostName() method of java InetAddress class returns the fully qualified domain name for this IP address, that means we may not be able to return FQDN depending on underlying system configuration.

Syntax:

Returns

It returns the fully qualified domain name for this IP address, or if the operation is not allowed by the security check, the textual representation of the IP address.

Example 1

import java.net.InetAddress;
public class JavaInetAddressGetCanonicalHostNameExample1 {
 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();
    System.out.println(hostnameCanonical);
        }
   }

Test it Now

Output: