THE NETWORK LAYER
If you look at the IP Address, the number are broken into different categories.
Classifications can be broken into 3 classes. They are:
Class A - Only the first octet is used for addressing and the balance used for hosts.
Class B - The first two octet are used for addressing and the balance used for hosts.
Class C - The first three octet are used for addressing and the balance used for hosts.
Presented by Kevin at ACSE CONFERENCE.