Ip Addresses; Ip Address Configuration - Omron Sysmac NJ-series User Manual

4 Determining IP Addresses
4-1

IP Addresses

4-1-1

IP Address Configuration

IP addresses are made up of 32 bits of binary data that specify the network number (net ID) and host
number (host ID). The network number identifies the network, and the host number identifies the node
(or host) on the network. IP addresses are divided into three classes, A, B, and C, so that the address
system can be selected according to the scale of the network. (Classes D and E are not used.)
Bit 31
Class A
0
Network ID (7 bits)
Bit 31
Class B
1 0
Bit 31
Class C
1 1 0
Bit 31
Class D
1 1 1
Bit 31
Class E
1 1 1
The number of networks in each class and the number of hosts possible on the network differ according
to the class.
Class
Class A
Class B
Class C
The 32 bits of binary data in an IP address are divided into four sections of eight bits each. IP
addresses are represented by the decimal equivalent of each of the four octets in the 32-bit address,
each separated by a period.
For example, the binary address 10000010 00111010 00010001 00100000 would be represented as
130.58.17.32.
4-2
23
Host ID (24 bits)
15
Network ID (14 bits)
Network ID (21 bits)
0 Multicast address
Experimental address
1
Number of networks
Small
Medium
Large
0
0
Host ID (16 bits)
7 0
Host ID (8 bits)
0
(Cannot be used.)
0
24
−2 max. (16,777,214 max.)
2
16
−2 max. (65,534 max.)
2
8
−2 max. (254 max.)
2
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User's Manual (W506)
(Cannot be used.)
Number of hosts