IP Classes
With IP V4, there are not enough IP addresses for everbody. To solve this problem, subnetting is used.
IP addresses consists of 2 parts, a node address and a network address.
The class of the address and the subnet mask determine which part belongs to the network address and which part belongs to the node address.
Each class is defined by the first 4 bits of the IP address.
•Class A = 0xxx, or 1 to 126
•Class B = 10xx, or 128 to 191
•Class C = 110x, or 192 to 223
•Class D = 1110, or 224 to 239
•Class E = 1111, or 240 to 254
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