There are five classes of IPv4 IP addresses: A, B, C, D, and E. Each class has its own set of IP addresses.  The overwhelming majority of devices in the Network employ classes A, B, and C. Class D and E are reserved for unique applications.

IP Class A: Address range from 1 to 126

IP Class B: Address range from 128 to 191

IP Class C: Address range from 192 to 223

IP Class D: Address range from 224 to 239

IP Class E: Address range from 240 to 254

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