How Do I Create a DNS Server in Python?


Angela Bailey

Creating a DNS Server in Python

A DNS (Domain Name System) server is a crucial component of the internet infrastructure. It translates human-readable domain names into IP addresses, allowing us to access websites by simply typing their names instead of remembering complex numeric addresses. In this tutorial, we will learn how to create a basic DNS server using Python.


Before we dive into coding our DNS server, let’s make sure we have everything we need:

  • Python installed on your computer
  • Basic understanding of networking concepts
  • Knowledge of Python socket programming

Setting Up the Project

To get started, let’s create a new directory for our project and navigate to it in the command line. Open your favorite text editor and create a new file named “”.

Importing Required Modules

First, let’s import the necessary modules for our DNS server:

import socket
import threading

Creating the DNS Server Class

Now, let’s define our DNS server class. We’ll call it “DNSServer” and it will inherit from the “threading.Thread” class to allow concurrent handling of multiple client requests.

class DNSServer(threading.Thread):
def __init__(self):

def run(self):
# Server logic goes here

The run() method:

The `run()` method is where our server logic will reside. It will be responsible for listening to incoming client requests and responding with appropriate DNS information.

Configuring Server Settings

Before we move on to implementing the `run()` method, let’s add some configurable settings to our DNS server. These settings will include the server’s IP address and port number.__init__()
self.ip = “127.0.1”
self.port = 53

Handling Incoming Requests

Now that we have our server class and basic configuration in place, let’s implement the `run()` method to handle incoming client requests.

def run(self):
with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as server_socket:
server_socket.bind((self.ip, self.port))
print(f”DNS Server listening on {self.ip}:{self.port}..”)

while True:
data, client_address = server_socket.recvfrom(1024)
print(f”Received request from {client_address[0]}:{client_address[1]}”)

# Parse the received DNS request
dns_request = self.parse_dns_request(data)

# Process the DNS request and generate a response
dns_response = self.process_dns_request(dns_request)

# Send the DNS response back to the client
server_socket.sendto(dns_response, client_address)


Congratulations! You have successfully created a basic DNS server using Python. Although this implementation is minimalistic, it provides a solid foundation for further enhancements and customization.

In this tutorial, we learned about the DNS system and its importance in translating domain names into IP addresses. We also covered how to set up a basic DNS server using Python’s socket programming capabilities. With this knowledge, you can now explore more advanced features like caching, handling different types of queries, and implementing security measures.

Remember to experiment with your DNS server and explore the vast possibilities that Python offers in networking and server-side development. Happy coding!

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