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Proxies are the simple tools you can use to compile your data from the web and boost your business without the fear of being blocked or banned. A proxy is an intermediary between your computer and the website you visit. When you don’t use a proxy server, a website can identify you by your Internet Protocol (IP) address. By using a proxy, you add an extra layer between your computer and the website. First, you connect to the proxy server that hides your actual IP address and displays a different one to the website. 

Some of the widespread use cases of proxies are:

  • Security
  • Privacy
  • Speed
  • Geolocation
  • Data Compilation

Some proxies don’t work due to several limitations. When you try to connect to the Internet, you get a timeout message. It is because the proxies are either too slow or don’t exist. Here comes the need for a proxy checker. You can save your time by using a proxy checker to test your proxies. It helps you scan the proxies in bulk. When you use free proxies, you should know they shut down without a moment’s choice. Therefore, you have to keep your proxy checker handy. You will have to use it daily to check which proxies are working. 

Tips To Use A Proxy Checker

Below are some of the tips you need to follow to use a proxy checker. 

  • Check the location – It is essential to check the location because if you go with a proxy that comes from a place known for cyberattacks, you will have difficulty accessing the desired content. You might get banned, and you will have to move to the next proxy on your list. 
  • Check the speed – Most people use proxy checkers to find the working proxies. It is essential, but you also need to look at the speed of the proxy checker. Some proxies work well but are incredibly slow. So, you have to spend most of your time online waiting for connections. 

How To Make A Proxy Checker In Python

Let’s see how we can make a proxy checker in Python with the help of the below steps.

Import Libraries

You need to import the following two libraries i-e.,

  • urllib.request
  • socket
import urllib.request , socket

Here, the urllib.request module defines the classes and the functions that help in opening URLs in the complex world. The URLs can either be a string or a Request object. 

On the other hand, a socket helps connect two nodes on a network to communicate with each other. You can import the socket library, make a simple socket and start two-way communication. The setdefaulttimeout() sets the default timeout for new sockets. 

Read The List Of Proxy IPs

You have to read the list of the proxy IPs in proxyList as shown below.

proxyList = ['']

The above line of code represents a sample proxy IP.

Define a Function

To check whether your proxies are working or not, you have to define a function as shown below.

def is_bad_proxy(pip):    
        proxy_handler = urllib.request.ProxyHandler({'http': pip})        
        opener = urllib.request.build_opener(proxy_handler)
        opener.addheaders = [('User-agent', 'Mozilla/5.0')]
    except urllib.error.HTTPError as e:        
        print('Error code: ', e.code)
        return e.code
    except Exception as detail:

        print( "ERROR:", detail)
        return 1
    return 0


  • The urllib.request.ProxyHandler causes the requests to go through a proxy. 
  • The urllib.request.build_opener returns an instance that chains the handlers in the order given.
  • addheaders is a property of urllib.opener(), and we need to change its value to an accepted User-Agent to fool the website we are visiting.
  • The urllib.request.install_opener installs an OpenerDirector instance as the default global opener. It is necessary to install the opener if you want urlopen to use that opener. Otherwise, you have to call instead of urlopen()
for item in proxyList:
    if is_bad_proxy(item):
        print ("Bad Proxy", item)
        print (item, "is working")

The is_bad_proxy() function detects the working proxies in the list of proxy IPs.

In the above code, the for loop iterates over the proxyList. If the proxy is not functional, we get a “Bad proxy” as a result. 

Uses Of A Proxy Checker

There are many uses of a proxy checker. Some of them are given below.

  • The firewalls use a proxy checker to ensure their relative anonymity before searching for restricted information online.
  • Someone like a school administrator can use a proxy checker to ensure that the network servers function normally. He can also use it for monitoring pupils that attempt to bypass firewall restrictions.
  • E-commerce sites, media and broadcasting companies use proxy checkers to control the geographic usage of their services for better targeting their advertising campaigns.
  • The proxy checkers protect E-commerce sites from scam orders and fraudulent data requests.
  • Proxy checkers or scanners are the frontline virtual defenders against the data hackers that try new ways to bypass internet security measures.


We discussed that proxies act as an intermediary between the client and the server. The proxy servers can act as a firewall, provide shared network connections, and cache data to speed up common requests. We can use a proxy checker to test our proxies to know which of them are working. Before using a proxy checker, we need to check the speed and location. Further, we saw we can make a proxy checker in Python by importing the necessary libraries and defining the proxy checker function that determines the nature of the proxy i-e., functional or non-functional. 

Hope you got to know how to make a proxy checker in Python.

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