What is the difference between DNS and reverse DNS?

Do you even need a DNS Server when using IPv4 addressing?

DavidG Aug 21 '17 at 17:58

DNS stands for Domain Name System. It is how the internet locates websites. Without it the world as we know it would not work! (or at least, it wouldn't be as nice and efficient as it is).

Reverse DNS is simply what you get when you make an online purchase. (as well as buying some other products) Most sites, at the very least, ask you to state your name or the company name you are buying from before making any transaction. The site you are visiting will then provide this info to a third party called a domain name registrar. The registrar will then publish your IP address as the domain name itself, so you can find out who owns your new domain.

The reason this is necessary is because your computers IP address could change (or your external facing IP address could change, it can change in several ways for example when you move to a new home). In order for the registrar to give you the most info that it possibly can, they also get your hostname which is that information which will be shown on your network's name resolution system so you can access any given computer on your network. (or just browse the www.google.com homepage).

When you register a domain name you essentially transfer ownership of that name from the current owner to you, so that it can no longer be used by anyone else. Since no one other than you has ownership of a domain name you shouldn't be worried about it changing and you shouldn't need to do anything to prevent your domain name from changing. If you do buy a domain name from somewhere else and want to use it, you may need to contact the registrar you purchased it from and ask them if they have a special program to "lock" or "verify" your ownership (by locking the account associated with it).

In short: A DNS servers main purpose is to keep track of addresses so that you don't get into trouble looking for a non-existent website. A registrar's main purpose is to make sure that when you buy a domain name you own it and you don't lose it (it is cheaper to buy one domain name than hundreds or thousands).

How do I create a reverse DNS lookup record?

How can I do a TCP reverse lookup?

If you ask a few of your peers, chances are that you'll find the answers to questions like the one above on your Facebook wall. And, as we get ready to bring you the latest edition of the Social Media Monitoring Podcast, I think it is safe to say that you probably know what I'm going to mention in this week's show because you have already searched the web on all your social networking platforms to find out what's new.

What do we mean by new anyway? I don't know about you, but I am talking with a lot of customers right now regarding the question, How do I monitor multiple social networking platforms? They either use just one or two as of today and they are looking for a simple solution to be able to monitor another or two or maybe even more. But before we go into the details of today's discussion, let's stop and think for a moment about the question, How do I monitor multiple social networking platforms? Most likely, there are lots of people who are monitoring these platforms in other ways, but I'm talking about those who just want to look at an aggregated report when they log into their monitoring tools. So, what to do? The question may have been in the back of your mind and I'm sure that the thought has crossed your mind, How do I monitor multiple social networking platforms and then, later on, report in a meaningful way? I am actually surprised that you are asking me for a solution to that question! But, if you're honest with yourself, this is probably one of the biggest challenges that we face in social media monitoring. Because, when we are thinking of social media marketing, all we want to do is to see where our followers are located, which hashtag works best in our content, and what content works best for each of our accounts.

As you think about monitoring multiple social networking platforms, here are a few things that may come into your head: Do they have a mobile-friendly site? Is it easy to sign up?

What is reverse DNS good for?

When we started our work in the field of cryptography, it was natural for us to develop a framework to evaluate cryptographic systems.

Today we are going to talk about how is reverse DNS (Reverse DNS) used. However, it is important to explain before why and when it is so useful. A DNS allows an internet user to type in a query name and find a website, but it also contains information that can be useful for attackers trying to break into computers or detect if computers are infected with malware. Reverse DNS provides information about the computer that the connection attempt was received from, allowing the Internet Service Provider (ISP) to trace the IP address back to the home or business of the computer being targeted. This is referred to as Reverse Name Resolution.

In this guide, we will present the different options for Reverse DNS and try to find the best for your specific environment. We also provide general options for network administrators that want to set Reverse DNS on their networks. With all the possible options and scenarios, it is pretty easy to get lost and not know where to start or even worse, you can end up breaking things if you don't know what you are doing or have done before! That's why, we will start with some examples and general guidelines, and then, go deep into more advanced options, focusing on:

Security and Privacy. Security and privacy have been our main concern throughout this guide, hence we are using a very high level of anonymity. So far, the most common way to get reverse DNS from within the United States is an HTTP tunneling service. We will start from there and explore a few more options.

HTTP Tunneling / Proxies. HTTP proxies, and the like, are simple and reliable services that allow you to send requests to Internet sites without you having to manually type the IP address of the server in the browser (also known as a Man-in-the-Middle attack). It works by taking the request from the browser and making a request to the proxy server instead, and sending it to the appropriate server at the other end. In this case, all you do is make a DNS query and the proxy acts as the server you were supposed to be connected to.

Should I use reverse DNS?

If I use the "myip" option to check a website's IP, is it better to do it by reverse DNS lookup, or by looking up the IP address and checking what the company it is registered to is called?

I'm getting confused because this is how it works: (1) If I get the IP address from a public IP site like myip.org (2) Then I have to do a reverse DNS lookup on the IP I got. (3) Then I have to go to whois.com (4) Then I have to find the company name. So for a reverse DNS lookup, I have to know the company name to do it, whereas if I use an IP address lookup, I can just go to whois.com to find the company name.

What are my options? Is there a right way of doing this? Thanks! Yes, you should always perform reverse DNS lookups. I would recommend using a tool that is good at what it does. I prefer dnsdumpster.com, but I don't know if it will do what you want. It shows the reverse lookup, the WHOIS records and more. It does all three of the things you listed in your question. When you choose a tool, make sure it does all three things, and it should provide more information than just a list of domain names with no other information.

To avoid any DNS cache issues, use a tool that can also retrieve the reverse IP from the A record. In addition, you can retrieve information about the host name via a tool like which retrieves the A records from DNS directly. For a large number of reverse lookups, I use dnslookup.net - it's free, provides a reverse lookup as well as more general lookups.