please explain ip address clasess?

Question

class A,B,C

Answer 1

There are 5 address classes:
Class A is for very large networks, such as a major international company might have.
Class B is used for medium-sized networks.
Class C addresses are commonly used for small to mid-size businesses.
Class D is used for multicasts
Class E is used for experimental purposes only.

Answer 2

http://www.firewall.cx/ip-classes.php