What is DDNS (Dynamic DNS) ?

Dynamic DNS (Domain Name System) is a method of automatically updating the IP address registered to a specific hostname or domain name. It allows a device or computer on a network to have a domain name assigned to it, which is more human-friendly than its IP address.

This is useful for users who want to access their home computers, automation system, cameras, servers, or other devices remotely, but do not have to buy a valid (Fixed) IP address. With dynamic DNS, they can assign a hostname or domain name to their dynamically changing IP address, allowing them to access their devices using a consistent, easy-to-remember address.

Keep in mind that all Internet providers usually use a dynamic IP for subscribers, which changes periodically, unless you buy a static IP (Valid).

How DNS Works?

• Step 1: 

  • The DNS resolver starts the lookup process by sending a query to the root DNS servers, which are the highest level of DNS servers. 

• Step 2:

  • The root DNS servers respond with a referral, indicating the top-level domain (TLD) DNS server responsible for the specific extension ( .com / .org / . net , …) of the domain name.

• Step 3:

  • The resolver then queries the TLD DNS server to find an authoritative DNS server for the domain. The authoritative DNS servers are responsible for storing and providing the IP address associated with the requested domain name.

• Step 4:

  • Finally, the resolver receives the IP address from the authoritative DNS server and sends it back to your device. Your device can then establish a connection to that IP address, allowing you to access the website you initially entered. Your device saves this response in the cache memory to use it for future reference.

What is DDNS and how does it work?

‘Dynamic DNS’ (DDNS/DynDNS) stands for Dynamic Domain Name System, This helps you to MAP your home router’s constantly changing IP addresses to a fixed domain name.

How to Register DDNS Name ?

You should register with a DDNS service and choose an available name (such as mynetwork.example.com).There are many companies for DDNS service, here is a list of free services:

Read More : How to Access our WiFi Router’s Web Console?

1- FreeDNS

One of the most popular and professional DDNS providers, with both free and premium accounts.

2- Dynu

Dynu is a flexible DDNS provider , you can have your own domain for top-level domain. You can have a free or premium account , but the interesting point is that,  even with the free account  you can obtain a SSL certificate to  increase your connection’s security level.

3- DuckDns

DuckDns is a simple DDNS service. It uses AWS (Amazon Web Services) infrastructure, and you can sign up for free using your Google, Reddit, Twitter, GitHub, or personal account.

4- NO-IP

NO-IP is a popular DDNS service with free and premium accounts, almost all routers support this provider.

5- DynDNS

DynDNS is a premium-based DDNS service and the free account is too limit.

Firstly, check your router’s DDNS configuration page(Typically this will be under Advanced and then DDNS or Dynamic DNS) to find the compatible DDNS providers (As you can see in the picture below).

Router’s Dynamic DNS configuration page

Then you should create an account on the relevant web site and register your “Host-Name” with your chosen domain(from available domain names). Then you should enter your account information in the router’s configuration page.

no-ip DDNS provider , account creation page

Conclusion:

DDNS is commonly used for remote access, home servers, gaming, and other applications that require a stable domain name regardless of the changing IP address. If you have a little technical knowledge, this service can be a very suitable alternative to buying a valid IP