23
A.6. Broadcast Address
The address with the host part bits set to ‘1” is the broadcast address,
meaning “for every station”.
Network and Broadcast addresses must not be used as a host address (e.g.
192.168.0.0 identifies the entire network, 192.168.0.255 identifies the
broadcast address).
A.7. IP Netmask
The netmask is used to divide the IP address differently from the standard
defined by the classes A, B, C. A netmask defines how many bits from the
IP address are to be taken as the network section and how many bits are to
be taken as the host section.
A.7.1. Standard IP Network Netmask:
Network Bits Host Bits Netmask
Class A 8 24 255.0.0.0
Class B 16 16 255.255.0.0
Class C 24 8 255.255.255.0
Network Bits
Host Bits
Netmask
Class A
8
24
255.0.0.0
Class B
16
16
255.255.0.0
Class C
24
8
255.255.255.0
Figure B-1
The number of host bits is entered; the NTS then calculates the netmask.
The netmask is displayed in standard decimal-dot notation..
IP Addresses, Netmask etc.
