Total number of Network and Host in different class of IPs

Class 'A'

(1-126). (0-255).(0-255).(0-255)

Net ID         Host ID

Total No. of Network = 126

Total No. of Host in a Network = (256×256×256)-2 = 16777216-2 = 16777214

Total No. of Computers = 126×16777214 = 2113928964

Class 'B'

(128-191).(0-255).(0-255).(0-255)

Net ID                     Host ID

Total No. of Network = 64×256 = 16384

Total No. of Host in a Network = (256×256)-2 = 65536-2 = 65534

Total No. of Computers = 16384×65534 = 1073741824

Class 'C'

(192-223).(0-255).(0-255).(0-255)

Net ID                            Host ID

Total No. of Network = 32×256×256 = 202752

Total No. of Host in a Network = 256-2 = 254

Total No. of Computers = 202752×254 = 532676608