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What is DDNS? How does it work and how to setup DDNS?

What is a DDNS (Dynamic DNS)?

DDNS, most commonly known as Dynamic DNS, is an automatic method of refreshing a name server. It can dynamically update DNS records without the need for human interaction. It is extremely useful for updating A and AAAA records when the host has changed its IP address.

Imagine this situation. You have a server in your office, and you are providing some service to your employees. You are using a standard/consumer-grade internet from a typical ISP (Internet service provider). You are getting a temporary IP address that could change the next type you connect or change automatically after some time. To provide a service, you 3 options:

  1. A Static IP address that could be expensive.
  2. Change manually the IP address every time when it changes.
  3. Automatically update the IP addresses – Dynamic DNS or DDNS!

DDNS is a service that automatically and periodically updates your DNS’s A (IPv4) or AAAA (IPv6) records when your IP address changes. These IP changes are made by your Internet provider.

With DDNS you don’t need to worry about the changes in IP addresses!

In this article, you can find more information about what DNS is!

How does DDNS work?

The DDNS works in the following way: The DDNS client monitors the IP address for changes. When the address changes (which it will if you have a dynamic IP address), the DDNS (or Dynamic DNS) service updates your new IP address.

Let’s get back to the same example from before, you owning a server, connected to the Internet, and want to share service from it. 

This server will be connected to the internal network, and it will communicate with the Internet via NAT (network address translation) router. The NAT router will provide an internal IP address to the server, probably via DHCP. To Make it available externally, we will need to perform port forwarding and get external Port (Portex) and external IP address (IPex). Now the service you want to share is visible with IPex and Portex, and people can use it through the Internet. The problem comes when this IP changes. 

First, you will need to register with a Dynamic DNS provider like us and set up a client software on your server. In the Dynamic DNS settings, you will give a fixed name to this server. Put the IPex, and we need to tell the NAT to automatically update it and send the data to the DNS server.  Inside the NAT’s settings, we will put the data from our Dynamic DNS service provider (our account and password). Now everything is ready. 

Free Dynamic DNS Service!

Why is it useful?

It can be very useful for people who want to host their website, access CCTV cameras, VPN, app or game server from their home computer. It is cheaper than to have a static public IP and by setting up DDNS, you will avoid the need to update all of your records whenever your IP changes manually. Also, static IP address is not always an option; it depends on your Internet provider.

DDNS is a very flexible option. The way that Dynamic DNS gives a connected device the ability to notify DNS servers to automatically update, alongside the active DNS configuration, IP addresses, configured hostnames and some other information. This saves the need of administrator who should do the changes.


As you can see DDNS is a very convenient solution, and it has different advantages, but the main ones are the following:

Accessibility – You will be able to access your website or server, easily, without being worried. The IP will change, but this won’t stop any of your activities.

Practicality – You don’t need a network administrator who to check and reconfigure your settings.

Economic – DDNS makes it cheaper; you won’t have IP address conflict in case you have many addresses, and they are used at the same time.

There are many other advantages, and you are probably thinking how to start using DDNS. Luckily for you, it is relatively easy to switch to it. You can get a free DDNS service from ClouDNS. We provide it with all our plans, including the entirely free one. Just sign up for a new free account from here and start using it.

Configuring Dynamic DNS

With each A and AAAA record, we provide a unique URL, so-called DynURL, when you are using our Dynamic DNS.
You can read the following step by step explications on how to configure it, depending on your operating system down below.

First for Windows users, regardless of the version you have on your device:

Dynamic DNS for Windows

Or watch the video tutorial:

If you are a MacOS or Linux user or another type of NIX system, you can follow these instructions:

Dynamic DNS for Linux, Mac and all types of *NIX systems

Or watch the video tutorial:

If you have multiple Internet providers:

Dynamic DNS for Linux, Mac and all types of *NIX systems with multiple network interfaces (Internet providers)

And even if you are using the data solutions of Synology, you can still benefit from the DDNS

DDNS for Synology

With the help of ClouDNS, you can start using DDNS right away. This can help your business or personal project. Read more about the DDNS here!

So what are you waiting for, start using it today!

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What is DDNS? How Does It Work and How to Setup DDNS?
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What is DDNS? How Does It Work and How to Setup DDNS?
What is DDNS? How does it work? Video and step by step tutorials on how to setup DDNS for Windows, Linux, MacOS and any other *NIX systems.
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