What Is Internal DNS Server?


Heather Bennett

An internal DNS server, also known as a private DNS server, is a critical component of any organization’s network infrastructure. It plays a crucial role in translating human-readable domain names into machine-readable IP addresses. In this article, we will explore the concept of an internal DNS server, its benefits, and how it works.

What is an Internal DNS Server?

An internal DNS server is a privately maintained DNS server that resolves domain names within a specific network or organization. Unlike public DNS servers like Google DNS or OpenDNS, which are accessible to the general public, an internal DNS server is designed for private use.

Benefits of Using an Internal DNS Server

There are several advantages to using an internal DNS server:

  • Improved Network Performance: By resolving domain names locally within the network, an internal DNS server reduces the reliance on external servers and improves overall network performance.
  • Enhanced Security: An internal DNS server allows organizations to have complete control over their domain name resolution process. This control enables them to implement security measures such as filtering malicious websites or blocking access to specific domains.
  • Easier Resource Management: With an internal DNS server, organizations can create custom domain names and easily manage their resources within the network. This simplifies resource allocation and allows for efficient management of services such as email servers, web servers, and file servers.

How Does an Internal DNS Server Work?

An internal DNS server works by maintaining a database of domain name records within the private network. When a user requests a website or resource by entering its URL in a web browser, the request is sent to the internal DNS server for resolution.

The internal DNS server then checks its database for the corresponding IP address associated with the requested domain name. If the record is found, the internal DNS server returns the IP address to the user’s device, allowing it to establish a connection with the desired resource.

If the internal DNS server does not have a record for the requested domain name, it can forward the request to an external DNS server or root DNS server to fetch the required information. This process is known as recursive querying.

Configuring an Internal DNS Server

To set up an internal DNS server, you need to:

  1. Create a dedicated server or repurpose an existing one.
  2. Install DNS server software such as BIND (Berkeley Internet Name Domain) or Windows Server’s DNS role.
  3. Configure the DNS zones and records according to your network requirements.
  4. Update your network devices and client machines to use the internal DNS server as their primary DNS resolver.

Once configured, you can start managing your domain names and their associated IP addresses within your private network using the internal DNS server.


An internal DNS server is an essential tool for organizations that want greater control over their network’s domain name resolution process. It offers improved performance, enhanced security, and simplified resource management. By setting up and configuring an internal DNS server, organizations can ensure efficient and secure access to resources within their private networks.

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