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Class A
If the very first number of
the 32 binary digits is set to 0, this is a Class A
address. The common subnet mask is 255.0.0.0.
The subnet mask is a shorthand way of telling both the network
admin, and the underlying innards of TCP/IP, how much of the address
is used for the network (or subnet) number, and how much is used for
the host number. The subnet number 255 hides the
first 8 bits of the address so it used for the
network number. This becomes the unique network number
that can range between 001.n.n.n and 126.n.n.n.
If you look at the binary math, you see it is possible to create
the number 127, however that number as a reserved
meaning in TCP/IP. The last 24 bits are available
for separate clients. While Class A networks have the
fewest network numbers, they have the possibility of
supporting the most client devices.
Each network address class has a
range of private network addresses or ID’s, reserved for use on
networks without a direct connection to the Internet. In order to receive
a public IP address, an individual or organization must acquire it from
their ISP or from the administrators of the Internet. What if an organization
isn’t connected to the Internet, or only allows a limited number
of users to connect to it? They don’t need a public network
address, if all they want to do is allow their internal users to communicate
with each other. So, TCP/IP reserves a range within each address class
for this purpose.
 Address Allocation for Private Networks
Address allocation for private networks is described in more detail in RFC 1587.
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In Class A, the reserved private
network range is 10.0.0.0 – 10.255.255.255.
Class A
Be familiar with the fact that IP ranges in Class A addresses are 1-126, and the default subnet mask is 255.0.0.0 Hosts can range from n.0.0.1 to n.255.255.254. |
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