Entering the IP Parameters
28
2.1
IP Parameter Basics
UM Basic Configuration L3P
Release
7.1
12/2011
Figure 7: Bit representation of the IP address
An IP address belongs to class A if its first bit is a zero, i.e. the first decimal
number is less than 128. The IP address belongs to class B if the first bit is a
one and the second bit is a zero, i.e. the first decimal number is between 128
and 191. The IP address belongs to class C if the first two bits are a one, i.e.
the first decimal number is higher than 191.
Assigning the host address (host id) is the responsibility of the network
operator. He alone is responsible for the uniqueness of the IP addresses he
assigns.
2.1.2 Netmask
Routers and gateways subdivide large networks into subnetworks. The
netmask assigns the IP addresses of the individual devices to a particular
subnetwork.
The division into subnetworks with the aid of the netmask is performed in
much the same way as the division of the network addresses (net id) into
classes A to C.
The bits of the host address (host id) that represent the mask are set to one.
The remaining bits of the host address in the netmask are set to zero (see
the following examples).
Net ID - 7 bits Host ID - 24 bits0
I
I
I
0
I
III
0
III0
Net ID - 14 bits
Net ID - 21 bits
Multicast Group ID - 28 bits
reserved for future use - 28 b its
Class A
Class B
Host ID - 16 bits
Host ID - 8 bit s
Class C
Class D
Class E
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