Classfull IP Address:

the Default mask of Classes are called Classful ,Example:
Class A= 255.0.0.0 , Classs B: 255.255.0.0 Class C= 255.255.255.0


Classless IP adress:

Defined by System Administrator. ite means used From IP Sub netting

Example: Class A: IP 10.0.0.0 /9 => sub net = 255.128.0.0
Class B: Ip 172.0.0.0 /18 => Sub net => 255.255.192.0
Class C: IP 192.0.0.0/ 27 =>sub net => 255.255.255.224

Nasir Ayubi KBL Afghanistan
IT . Trainer