CLASS A IP - A group of IP addresses where the first number remains the same, and the last three can vary. It could be represented by w.x.y.z, where the x, y, and z can be any number from 0-255, and the w represents the first static part of the IP address (e.g., 10.x.y.z). Thus, the number of possible combinations within the Class A address are 256*256*256 = 16,777,216. Of course, some of the addresses, like those ending in .0 and .255, are not used, so the actual number of usable addresses in a Class A is somewhat less than that. The subnet mask of a class A IP address is 255.0.0.0. Thus, only the last three digits of the IP address are used to determine where traffic gets routed within the Class A. There are 254 class A groups in existence. |
CLASS A IP Definition
