What Is a Internal DNS Server?


Larry Thompson

An internal DNS server, also known as a local DNS server, is a crucial component of a computer network. It plays a vital role in translating domain names into their corresponding IP addresses. In this article, we will explore what an internal DNS server is and how it functions.

What is DNS?

DNS stands for Domain Name System. It is a hierarchical decentralized naming system for computers, services, or any resource connected to the Internet or a private network.

The primary function of DNS is to translate human-readable domain names into machine-readable IP addresses. For example, when you type “www.example.com” into your web browser, the DNS server translates it into an IP address like “” that identifies the location of the website’s server on the internet.

Internal DNS Server

An internal DNS server refers to a DNS server that operates within a private network. It provides name resolution services exclusively for devices and resources within that network.

Organizations typically set up internal DNS servers to enhance network efficiency and security by allowing devices within the network to communicate using domain names instead of IP addresses.

Benefits of Internal DNS Servers

  • Centralized Management: Internal DNS servers allow organizations to have centralized control over their network’s domain name resolution process. This makes it easier to manage and update domain name records as needed.
  • Faster Resolution: By caching frequently accessed domain names locally, an internal DNS server can significantly improve response times for users within the network.
  • Enhanced Security: Internal DNS servers can be configured to block access to malicious websites or restrict access based on specific policies, providing an additional layer of security for the network.

How Internal DNS Servers Work

When a device within a private network sends a request to access a website, the request is first received by the internal DNS server. The DNS server then checks its local cache to see if it has the IP address corresponding to the requested domain name.

If the IP address is found in the cache, it is immediately returned to the requesting device. This process is known as DNS resolution.

If the IP address is not found in the cache, the internal DNS server then queries external DNS servers on behalf of the requesting device. Once it receives a response from an external DNS server, it stores the IP address in its cache and returns it to the requesting device.


An internal DNS server is an essential component of any private network. It enables devices within the network to communicate using domain names and provides centralized management, faster resolution, and enhanced security.

By understanding how an internal DNS server works and its benefits, organizations can optimize their network infrastructure for efficient and secure communication.

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