24
Figure 2.4: IPv4 address
The above diagram shows the representation of IPv4 address in decimal form as well as
in bit.
2.4.2.1 Network Addressing
As already
mentioned earlier,
there are
five different address classes of IP address.
The
network address
is
identified by the classes.
The cases can be determined by
looking at
the
first
octet
of
an
IP
address.
If
the
first
octet
is
a
number
between
0
and
126,
it
is
a
Class
A
network.
Class
B
network starts
from 128 to 191.
Class C
network
is between
192 to 223. Class D network is used for multicast and is available from 224 to 239. Last
but not
least, Class E
network is used for experimental use, and it starts from 240 to 255.
In binary form, we can identify a class of a particular address by examining the first four
bits of an IP address. Here are the criteria:
•
If the first bit is a zero, the address is a Class A address.
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