Lantronix XPress-DR XPress-DR / XPress-DR-IAP - User Guide - Page 130

Network Address, Broadcast Address, IP Netmask, Network, Host Bits

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IP Addresses 10.4 Network Address The host address with all host bits set to 0 is used to address the network as a whole (in routing entries, for example). 10.5 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 (for example, 192.168.0.0 identifies the entire network and 192.168.0.255 identifies the broadcast address). 10.6 IP Netmask The netmask is used to divide the IP address differently from the standard defined by 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. When the number of host bits is entered, the DSTni-XPress DR calculates the netmask. The netmask is displayed in standard decimal-dot notation. Class A Class B Class C Network Bits 8 16 24 Host Bits 24 16 8 Netmask 255.0.0.0 255.255.0.0 255.255.255.0 Netmask 255.255.255.252 255.255.255.248 255.255.255.240 255.255.255.224 255.255.255.192 255.255.255.128 255.255.255.0 255.255.254.0 255.255.252.0 255.255.248.0 . . 255.128.0.0 255.0.0.0 Host bits 2 3 4 5 6 7 8 9 10 11 . . 23 24 10-2 DSTni-XPress DR User Guide

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IP Addresses
10.4 Network Address
The host address with all host bits set to 0 is used to address the network as a whole (in
routing entries, for example).
10.5 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 (for example,
192.168.0.0 identifies the entire network and 192.168.0.255 identifies the broadcast address).
10.6 IP Netmask
The netmask is used to divide the IP address differently from the standard defined by 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. When the number of host bits is
entered, the DSTni-XPress DR calculates the netmask. The netmask is displayed in standard
decimal-dot notation.
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
Netmask
Host bits
255.255.255.252
2
255.255.255.248
3
255.255.255.240
4
255.255.255.224
5
255.255.255.192
6
255.255.255.128
7
255.255.255.0
8
255.255.254.0
9
255.255.252.0
10
255.255.248.0
11
.
.
.
.
255.128.0.0
23
255.0.0.0
24
10-2
DSTni-XPress DR User Guide