Basics of socket programming in python using UDP protocol

Socket :

Sockets allow communication between two different processes on the same or different machines, Just by using a combination of IP Address and Port Number

Socket = [ IP : port ]

Let's Understand how this only two thing can enable us to communicate:

  1. IP Address: → An IP address is a unique address that identifies a device on the internet or a local network.
  • How IP Address help in the socket: so IP Address is the one who takes us to that system
  • let's compare it with a real-world example. To reach to a friends house we required their Proper Address, Same Way In Internet world each system have their Unique IP Address which act as the Address of the system

2. Port Number→ whenever any program is executed it becomes process, system gives each process a unique Id, but Only some programs that have capabilities to go over a network,this some program’s Unique process Id is known as Port Number

Process Id ==Port number

  • How Port Number help in socket → Port used to connect to the specific program which is running in our system
  • For Example, we Reached to friend's house, IN that house other family members also live. How the Each member can uniquely be identified? Using the name, same way in a name OR port no. help in the system to uniquely connect to a specific program

Port Binding: To bind the Port Number(process ID of the program) and the reserve port number mentioned in the senders program

Reserve POrt: To make a socket we bind the IP Address to some random port no. which we mention in the sender's program

  • after binding the port we can check the socket in protocol-specific list of port IN our case we are using the UPD protocol

Task Description

🔅 Create your own Chat Servers, and establish a network to transfer data using Socket Programming by creating both Server and Client machine as Sender and Receiver both, using UDP data transfer protocol.


Create 2 Programs sender and receiver in different systems but should connect to the Network


In Receiver program need to mention the following things

  • import the socket module

import socket

  • Have to create the object of the socket and in argument need to put the address family of IP AF_INET is only for ipv4 type and the Protocol SOCK_DGRAM is for User Datagram Protocol(UDP)

protocol = socket.SOCK_DGRAM
ip_family = socket.AF_INET

s = socket.socket(ip_family,protocol)

  • Then bind the IP Address and the random port which we are reserving for the socket and binding this port to the process ID (Port)

port= 1234

  • use a function that receive the message 1024 kb is the max size of msg can received by this function

msg = s.recvfrom(1024)


when we run the program it will wait for the sender to send the msg

  • to see the listening socket we have a cmd (only for UDP protocol)

netstat -unlp

2. senders .py

let's create the senders program

  • import the socket module and create an object of the socket

import socket
s=socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

  • To send the msg we have a sendto() function which able to send data over a network, this only accepts byte type to send, encode() help to convert a string into a byte
  • put receiver's IP and Port

s.sendto(“hello”.encode() , ( “” , 3456) )

Let's run the and see the output of the receiver end

Here is the msg received which contain the data and the socket of sender


*****************************Thank you************************




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Akanksha Chhattri

Akanksha Chhattri

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