Reverse DNS

Question:
If I can use the “InetAddress” class to acquire the IP address of a computer, is there a way to get the computer’s name from an IP address?

Answer:
“InetAddress” can be used both to discover the IP address of a host and to discover the host name corresponding to an IP address. When you call “InetAddress.getByName(String host),” the host argument can be either a host name or a text representation of an IP address.

For example, run the following program with www.sun.com as an argument and it will print:

Name: www.sun.comIP: 192.18.97.195

Run it with 192.18.97.195 as an argument and it will print the same thing (if www.sun.com maps to multiple IP addresses, the actual address that results when you run the program may differ).

import java.net.*;import java.io.*;public class lookup {  public static void main(String[] args) {    if(args.length != 1) {      System.err.println("lookup host");      return;    }    try {      InetAddress address;      address = InetAddress.getByName(args[0]);      System.out.println("Name: " + address.getHostName());      System.out.println("IP: " + address.getHostAddress());    } catch(IOException ioe) {      ioe.printStackTrace();    }  }}

Share the Post:
Share on facebook
Share on twitter
Share on linkedin

Overview

The Latest

Top 5 B2B SaaS Marketing Agencies for 2023

In recent years, the software-as-a-service (SaaS) sector has experienced exponential growth as more and more companies choose cloud-based solutions. Any SaaS company hoping to stay ahead of the curve in this quickly changing industry needs to invest in effective marketing. So selecting the best marketing agency can mean the difference

technology leadership

Why the World Needs More Technology Leadership

As a fact, technology has touched every single aspect of our lives. And there are some technology giants in today’s world which have been frequently opined to have a strong influence on recent overall technological influence. Moreover, those tech giants have popular technology leaders leading the companies toward achieving greatness.

iOS app development

The Future of iOS App Development: Trends to Watch

When it launched in 2008, the Apple App Store only had 500 apps available. By the first quarter of 2022, the store had about 2.18 million iOS-exclusive apps. Average monthly app releases for the platform reached 34,000 in the first half of 2022, indicating rapid growth in iOS app development.