1. στο goolge type Subnet Mask Calculator geeks
2. επιλέξτε https://www.geeksforgeeks.org/utilities/subnet-mask-calculator/
3. στο πρώτη φόρμα IPv4 Subnet Calculator 
		α. επιλέξτε Network Class	 Any 
 		β. επιλέξτε Subnet 255.255.255.0 /24
		γ. Ip Address γραψτε 192.168.10.5

 4. press Calculate Button 
 5. Παρατηρήστε προσεκτικά τα αποτελέσματα
IP Address		192.168.10.5
Network Address		192.168.10.0
Subnet Mask		255.255.255.0
First Host		192.168.10.1
Last Host		192.168.10.254
Broadcast Address	192.168.10.255

 6. ΠΡΟΣΠΑΣΘΗΣΤΕ ΝΑ ΤΑ ΚΑΤΑΝΟΗΣΕΤΕ ΚΑΙ ΝΑ ΤΑ ΕΞΑΓΕΤΑΙ ΜΟΝΟΙ ΣΑΣ
**************************************************************************************
 7. Αλλάξτε το Subnet 255.255.255.128  /25

 8. ΜΠΟΡΕΙΤΕ ΝΑ ΥΠΟΛΟΓΙΣΕΤΕ ΜΟΝΟΙ ΣΑΣ ΤΑ ΠΑΡΑΚΑΤΩ ΠΕΔΙΑ??
Network Address		?
Subnet Mask		?
First Host		?
Last Host		?
Broadcast Address	?

**************************************************************************************
9. ΑΛΛΑΖΩ ΤΟ ΙP Address σε 192.168.10.150
10. ΜΠΟΡΕΙΤΕ ΝΑ ΥΠΟΛΟΓΙΣΕΤΕ ΜΟΝΟΙ ΣΑΣ ΤΑ ΠΑΡΑΚΑΤΩ ΠΕΔΙΑ??
Network Address		?
Subnet Mask		?
First Host		?
Last Host		?
Broadcast Address	?
           
**************************************************************************************







# θεωρια
#https://www.geeksforgeeks.org/utilities/subnet-mask-calculator/

# python editor
#https://www.programiz.com/python-programming/online-compiler/

import socket
hostname = socket.gethostname()
IPAddr = socket.gethostbyname(hostname)

print("Your Computer Name is:" + hostname)
print("Your Computer IP Address is:" + IPAddr)
import ipaddress

x = "192.168.10.160/27"
net4 = ipaddress.ip_network(x)
print(net4)
print ("count of ALL ip address", net4.num_addresses)
print ("broadcast " , net4.broadcast_address)


ipaddress = "192.168.10.160"
pinakas = ipaddress.split(".")
print (pinakas)

part0 = int(pinakas[0])
part1 = int(pinakas[1])
part2 = int(pinakas[2])
part3 = int(pinakas[3])
print  (part0, part1, part2, part3)

print (" se dyadiki morfi ")
print(format(part0, '08b'))
print(format(part1, '08b'))
print(format(part2, '08b'))
print(format(part3, '08b'))

import ipaddress

# Read IP and mask from the user
ip = input("Enter IP address (e.g., 192.168.1.10): ")
mask = input("Enter subnet mask (e.g., 255.255.255.0): ")

# Combine into CIDR format
# Convert mask to prefix length automatically
network = ipaddress.IPv4Network(f"{ip}/{mask}", strict=False)
# Print network address
print("Network address:", network.network_address)


import ipaddress
# Read IP/CIDR from user
cidr_ip = input("Enter IP address in CIDR format (e.g., 192.168.1.10/24): ")
# Create network object (strict=False allows host IP)
network = ipaddress.ip_network(cidr_ip, strict=False)

# Print the network address
print("Network address:", network.network_address)