Manual VIPA CPU 21x
Chapter 4 Deployment of the CPU 21x-2BT10 with TCP/IP
HB103E - Rev. 05/45
4-11
For IPv4 addresses there are five address formats (class A to class E) that
are all of a length of 4 Byte = 32 Bit.
Class A
0 Network-ID
(1+7 bit)
Host-ID (24 bit)
Class B
10 Network-ID (2+14 bit)
Host-ID (16 bit)
Class C
110
Network-ID (3+21 bit)
Host-ID (8 bit)
Class D
1110
Multicast group
Class E
11110
Reserved
The classes A, B and C are used for individual addresses, class D for
multicast addresses and class E is reserved for special purposes.
The address formats of the 3 classes A, B, C are only differing in the length
of Network-ID and Host-ID.
To build up private IP-Networks within the internet, RFC1597/1918
reserves the following address areas:
Network
class
Start IP
End IP
Standard subnet mask
A 10.0.0.0 10.255.255.255 255.0.0.0
B 172.16.0.0 172.31.255.255 255.255.0.0
C 192.168.0.0 192.168.255.255 255.255.255.0
(The Host-ID is underlined.)
These addresses can be used as net-ID by several organizations without
causing conflicts, for these IP addresses are neither assigned in the
internet nor are routed in the internet.
Some Host-IDs are reserved for special purposes.
Host-ID = 0
Identifier of this network, reserved!
Host-ID = maximum (binary complete 1)
Broadcast address of this network
Note!
Never choose an IP address with Host-ID=0 or Host-ID=maximum!
(e.g. for class B with subnet mask = 255.255.0.0, the "172.16.0.0" is
reserved and the "172.16.255.255" is occupied as local broadcast address
for this network.)
Address classes
Private IP networks
Reserved
Host-Ids
Summary of Contents for CPU 21 Series
Page 1: ...Manual VIPA CPU 21x Order No VIPA HB103E Rev 05 45 ...
Page 2: ...Lerrzeichen ...
Page 6: ...About this Manual Manual VIPA CPU 21x Subject to change to cater for technical progress ...
Page 10: ...Contents Manual VIPA CPU 21x iv HB103E Rev 05 45 ...
Page 30: ...Chapter 1 Principles Manual VIPA CPU 21x 1 18 HB103E Rev 05 45 ...
Page 58: ...Chapter 2 Hardware description Manual VIPA CPU 21x 2 28 HB103E Rev 05 45 ...
Page 80: ...Chapter 3 Deployment CPU 21x Manual VIPA CPU 21x 3 22 HB103E Rev 05 45 ...
Page 178: ...Chapter 5 Deployment CPU 21x 2BT02 with H1 TCP IP Manual VIPA CPU 21x 5 48 HB103E Rev 05 45 ...