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MAMPIER SEJENAKView my complete profile. Friday, October 1, 2010. The concept of network classes is a little obsolete as subnets are now used to define smaller networks. These subnets may be part of a class A, B, C, etc network. For historical reference the network classes are defined as follows:. Class A: Defined by the first 8 bits with a range of 0 - 127. First number (8 bits) is defined by Internic i.e. 77.***.***.***. One class A network can define 16,777,214 hosts. One class B network can define 65,534 hosts.
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