What Is DNS Server for Comcast?


Angela Bailey

A DNS (Domain Name System) server is a crucial component of the internet infrastructure that translates domain names into IP addresses. In the case of Comcast, one of the largest internet service providers in the United States, they operate their own DNS servers to facilitate this translation process.

Why Does Comcast Have Its Own DNS Servers?

Comcast’s decision to have its own DNS servers is primarily driven by two main factors: performance and security.


By operating their own DNS servers, Comcast can optimize and fine-tune the performance of their network. This allows them to efficiently handle a large volume of DNS queries from their customers, resulting in faster response times and improved overall browsing experience.


Having control over their DNS infrastructure gives Comcast an added layer of security. By managing their own servers, they can implement robust security measures such as firewalls, intrusion detection systems, and regular vulnerability assessments. This helps protect users from potential cyber threats like phishing attacks or domain hijacking.

How Does Comcast’s DNS Server Work?

To understand how Comcast’s DNS server works, let’s break down the process into simple steps:

Step 1: User Request

  • The user enters a domain name (e.g., www.example.com) in their web browser.
  • The browser sends a request to Comcast’s DNS server to resolve the domain name into an IP address.

Step 2: Checking Local Cache

  • The Comcast DNS server first checks its local cache for a previously resolved IP address for the requested domain. If found, it directly returns the IP address to the user’s browser.

Step 3: Recursive DNS Lookup

  • If the requested domain is not found in the local cache, Comcast’s DNS server performs a recursive DNS lookup.
  • It starts by querying the root DNS servers to determine the authoritative DNS server for the top-level domain (TLD) of the requested domain (e., .com).
  • Once it obtains the TLD’s authoritative DNS server, it sends another query to that server to obtain the authoritative DNS server for the second-level domain (e., example.
  • Finally, it queries the second-level domain’s authoritative DNS server to obtain the IP address associated with the requested domain name.

Step 4: Caching and Response

  • The Comcast DNS server caches the resolved IP address for future use and returns it to the user’s browser.
  • The browser then uses this IP address to establish a connection with the webserver hosting the requested website.

Benefits of Using Comcast’s DNS Servers

Improved Performance:

By using Comcast’s DNS servers, customers can benefit from faster response times due to their optimized network infrastructure. This can lead to quicker website loading times and a smoother browsing experience.

Enhanced Security:

Comcast’s focus on security means that their DNS servers are equipped with advanced measures to protect users from potential online threats. This helps safeguard users’ personal information and prevents unauthorized access to their browsing activities.


As one of the largest ISPs in the US, Comcast ensures high availability and reliability of their DNS servers. This means fewer instances of downtime or service interruptions, allowing users to access the internet without disruption.

How to Use Comcast’s DNS Servers?

To use Comcast’s DNS servers, you can manually configure your network settings or router to use the following DNS server addresses:

Primary DNS Server: 75.75.75

Secondary DNS Server: 75.76.76

By setting these IP addresses as your preferred DNS servers, your devices will utilize Comcast’s infrastructure for domain name resolution.

Configuring DNS in Windows:

  1. Go to the Control Panel and open “Network and Sharing Center”.
  2. Select your network connection, right-click, and choose “Properties”.
  3. In the Properties window, select “Internet Protocol Version 4 (TCP/IPv4)” and click “Properties”.
  4. Select the option to “Use the following DNS server addresses” and enter the primary and secondary DNS server addresses provided by Comcast.
  5. Click “OK” to save the changes.

Configuring DNS in macOS:

  1. Open System Preferences and click on “Network”.
  2. Select your active network connection from the left sidebar.
  3. Click on “Advanced” and navigate to the “DNS” tab.
  4. In the list of DNS servers, click on the “+” button at the bottom.
  5. Add both primary and secondary Comcast DNS server addresses.

By following these steps, your devices will use Comcast’s DNS servers for domain name resolution, benefiting from their performance and security features.


In summary, Comcast operates its own DNS servers to improve performance, enhance security, and provide reliable domain name resolution for its customers. By utilizing their infrastructure or manually configuring your devices to use their DNS server addresses, you can enjoy faster browsing speeds and increased protection against online threats.

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