Class B Subnetting
You can recognise a Class B address because the
first octet is a number from 128 to 191 inclusive. So any
of the below IP addresses are class B.
128.1.2.4
177.2.3.5
191.1.2.3
Network devices recognise a Class B address as
such because the numbers are checked in binary and the first number
in the first octet always begins with the binary number 10.
Check the binary section for more info on that.
Class B addresses lock the first two octets for
network numbers. The remaining three octets can be used for
host numbers. It works like this:
| Network |
Network |
Host |
Host |
| 129 |
23 |
2 |
4 |
In the above example 129.23 is the network number
and 2.4 is a host on that network.
Please note that Class A, B and C addresses are
only called such for historical purposes now and you may find that
your company could be allocated a Class A address or even one for
your home IP address for your broadband connection.
VLSM means
that we don't have to concern ourselves with Classes of address
anymore.
Subnetting Secrets Works
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Director |
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