How to get IP address of all devices connected on WLAN

Am working on a Django website. Basically, I want to block and IP once it perform an operation, when that Particular IP comes to perform that same operation then the system will not allow it. Now my problem is if a set of devices are connected on the same network and an operation is performed on the site, another person on that same network cannot perform that operation again because the IP has already been used, so how do I get all IP address connected through WLAN.

This the code am using

import ipaddress
import socket
import re

def is_valid_ip(ip_address):
    """ Check Validity of an IP address """

        ip = ipaddress.ip_address(u'' + ip_address)
        return True
    except ValueError as e:
        return False

def is_local_ip(ip_address):
    """ Check if IP is local """

        ip = ipaddress.ip_address(u'' + ip_address)
        return ip.is_loopback
    except ValueError as e:
        return None

def get_ip_address_from_request(request):
    """ Makes the best attempt to get the client's real IP or return the loopback """
    PRIVATE_IPS_PREFIX = ('10.', '172.', '192.', '127.')
    ip_address = ''
    x_forwarded_for = request.META.get('HTTP_X_FORWARDED_FOR', '')
    if x_forwarded_for and ',' not in x_forwarded_for:
        if not x_forwarded_for.startswith(PRIVATE_IPS_PREFIX) and is_valid_ip(x_forwarded_for):
            ip_address = x_forwarded_for.strip()
        ips = [ip.strip() for ip in x_forwarded_for.split(',')]
        for ip in ips:
            if ip.startswith(PRIVATE_IPS_PREFIX):
            elif not is_valid_ip(ip):
                ip_address = ip
    if not ip_address:
        x_real_ip = request.META.get('HTTP_X_REAL_IP', '')
        if x_real_ip:
            if not x_real_ip.startswith(PRIVATE_IPS_PREFIX) and is_valid_ip(x_real_ip):
                ip_address = x_real_ip.strip()
    if not ip_address:
        remote_addr = request.META.get('REMOTE_ADDR', '')
        if remote_addr:
            if not remote_addr.startswith(PRIVATE_IPS_PREFIX) and is_valid_ip(remote_addr):
                ip_address = remote_addr.strip()
    if not ip_address:
        ip_address = ''
    return ip_address

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