Develop a socket programming application using connected oriented protocol where the server identifies the class of the IP address received from the client. The server needs to determine whether the IP address falls into Class A, B, C, or is invalid.

Sure, here is a simple Python socket programming application that identifies the class of an IP address received from the client.

Server Side:

import socket

def classify_ip(ip):
    ip = [int(x) for x in ip.split('.')]
    if ip[0] >= 1 and ip[0] <= 126:
        return "Class A"
    elif ip[0] >= 128 and ip[0] <= 191:
        return "Class B"
    elif ip[0] >= 192 and ip[0] <= 223:
        return "Class C"
    else:
        return "Invalid"

server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.bind(('localhost', 12345))
server_socket.listen(5)

while True:
    client_socket, addr = server_socket.accept()
    ip_address = client_socket.recv(1024).decode()
    print('Received IP:', ip_address)
    print('IP Class:', classify_ip(ip_address))
    client_socket.close()

Client Side:

import socket

client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.connect(('localhost', 12345))

ip_address = input("Enter an IP address: ")
client_socket.send(ip_address.encode())

client_socket.close()

In this code, the server creates a socket and listens for a connection from the client. The client sends an IP address to the server, which the server then classifies into Class A, B, C, or Invalid based on the first octet of the IP address. The server then prints the received IP address and its class.