Subnet mask binary all "1" binary all "0"
IPv4 address Net-ID Host-ID
Subnet mask and IPv4 address Net-ID Subnet-ID new Host-ID
At the first start-up of the CPU, the Ethernet PG/OP channel does not have an IP
address.
Information about the assignment of IP address data to the Ethernet PG/OP channel may
be found in
Ä
Chapter 4.6 ‘Hardware configuration - Ethernet PG/OP channel’
on page 61.
For IPv4 addresses there are five address formats (class A to class E) that are all of a
length of 4byte = 32bit.
Class A 0 Network-ID (1+7bit) Host-ID (24bit)
Class B 10 Network-ID (2+14bit) Host-ID (16bit)
Class C 110 Network-ID (3+21bit) Host-ID (8bit)
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 dif
fering in the length of Network-ID and Host-ID.
These addresses can be used as net-ID by several organizations without causing con-
flicts, for these IP addresses are neither assigned in the Internet nor are routed in the
Internet. To build up private IP-Networks within the Internet, RFC1597/1918 reserves the
following address areas:
Network class from IP to 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.)
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
Address at first start-up
Address classes
Private IP networks
Reserved Host-IDs
VIPA System MICRO
Deployment PG/OP communication - productive
Basics - IP address and subnet
HB400 | CPU | M13-CCF0000 | en | 16-47 145
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