Class A Addresses
Written on 03:27 by Ahmet Emir
In a Class A arrangement address, the aboriginal byte is assigned to the arrangement abode and the three
remaining bytes are acclimated for the bulge addresses. The Class A architecture is as follows:
network.node.node.node
For example, in the IP abode 49.22.102.70, the 49 is the arrangement abode and 22.102.70 is
the bulge address. Every apparatus on this accurate arrangement would accept the characteristic network
address of 49.
Class A arrangement addresses are 1 byte long, with the aboriginal bit of that byte aloof and the
7 absolute $.25 accessible for abetment (addressing). As a result, the best number
of Class A networks that can be created is 128. Why? Because anniversary of the 7 bit positions can
be either a 0 or a 1, appropriately 27, or 128.
To complicate affairs further, the arrangement abode of all 0s (0000 0000) is aloof to designate
the absence avenue (see Table 2.4 in the antecedent section). Additionally, the abode 127,
which is aloof for diagnostics, can’t be acclimated either, which agency that you can absolutely only
use the numbers 1 to 126 to baptize Class A arrangement addresses. This agency the absolute number
of accessible Class A arrangement addresses is 128 bare 2, or 126.
The IP abode 127.0.0.1 is acclimated to analysis the IP assemblage on an alone bulge and
cannot be acclimated as a accurate host address.
Each Class A abode has 3 bytes (24-bit positions) for the bulge abode of a machine. This
means there are 224—or 16,777,216—unique combinations and, therefore, absolutely that
many accessible different bulge addresses for anniversary Class A network. Because bulge addresses with
the two patterns of all 0s and all 1s are reserved, the absolute best accessible cardinal of nodes
for a Class A arrangement is 224 bare 2, which equals 16,777,214. Either way, that’s a huge
amount of hosts on a arrangement segment!
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