What Is DNS Server in Azure VNET?


Scott Campbell

A DNS server is a critical component in any network infrastructure, including Azure Virtual Network (VNET). In this article, we will explore what a DNS server is and its significance in an Azure VNET environment.

What Is a DNS Server?

A DNS (Domain Name System) server is a crucial part of the internet’s infrastructure. It translates human-readable domain names like www.example.com into machine-readable IP addresses like This translation allows computers to communicate with each other over the internet using domain names rather than complicated IP addresses.

The Role of DNS in Azure VNET

In an Azure VNET, the DNS server plays a vital role in name resolution for resources within the virtual network. It enables seamless communication between virtual machines (VMs), services, and other resources by resolving their domain names to their respective IP addresses.

Default DNS Configuration

By default, Azure VNET provides its own built-in DNS service that resolves names for resources within the virtual network. The default configuration assigns each VM with a dynamic IP address and registers its hostname with this built-in DNS service.

Note: It is important to note that the default DNS configuration may not be suitable for all scenarios and might require customization based on specific requirements.

Customizing DNS Settings

If you have specific requirements or want to use your own custom DNS server for name resolution within your Azure VNET, you can easily configure it.

  • Create a Virtual Network: Start by creating a virtual network in the Azure portal if you haven’t already done so.
  • Create or Import a VM: Create or import a VM into your virtual network.
  • Configure DNS Settings: In the Azure portal, navigate to the virtual network and select the “DNS servers” option. Here, you can specify the IP addresses of your custom DNS servers.
  • Restart VMs: Restart your VMs for the changes to take effect and for them to start using the custom DNS server for name resolution.

Benefits of Custom DNS Servers

Using custom DNS servers in Azure VNET offers several benefits:

  • Name Resolution Control: You have full control over name resolution within your virtual network, allowing you to customize it as per your requirements.
  • Integration with Existing Infrastructure: If you have an on-premises network or other cloud environments with their own DNS servers, you can integrate them seamlessly with your Azure VNET.
  • Enhanced Security: Custom DNS servers allow you to implement additional security measures such as filtering malicious domains or implementing internal-only name resolution.

In Conclusion

Azure VNET relies on DNS servers for efficient name resolution within the virtual network. Whether using the default built-in DNS service or customizing it with your own DNS servers, understanding and configuring the DNS settings is essential for seamless communication between resources in an Azure VNET environment.


  • DNS: Domain Name System
  • VNET: Virtual Network
  • Azure: Microsoft Azure Cloud Computing Platform
  • IP Address: Internet Protocol Address
  • VM: Virtual Machine

Now that you have a good understanding of DNS servers in Azure VNET, you can confidently configure and manage the DNS settings to suit your specific requirements.

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