In this example we shall show you how to retrieve the IP address from the hostname of a specific host. To get the IP address using a hostname one should perform the following steps :
- Retrieve the Address object of the specific host. This object contains all address related information about the specific host
- Use the
getAddress()API method to get a byte array representation of the IP address of the specific host. In order to convert the byte array representation to a more readable one you may perform a conversion like the one shown in the code snippet below
If the specific host address exists and there is no connectivity issues between the client and the host machines then you should be able to get the hostname from the designated host IP address.
package com.javacodegeeks.snippets.core;
import java.net.InetAddress;
import java.net.UnknownHostException;
public class GetIPAddressFromHostname {
public static void main(String[] args) {
try {
InetAddress inetAddr = InetAddress.getByName("javacodegeeks.com");
byte[] addr = inetAddr.getAddress();
// Convert to dot representation
String ipAddr = "";
for (int i = 0; i < addr.length; i++) {
if (i > 0) {
ipAddr += ".";
}
ipAddr += addr[i] & 0xFF;
}
System.out.println("IP Address: " + ipAddr);
}
catch (UnknownHostException e) {
System.out.println("Host not found: " + e.getMessage());
}
}
}
This was an example of how to get the IP address from the hostname of a specific host in Java.
Output:
IP Address: 216.239.34.21
