4 Determining IP Addresses
4-4
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
As shown in the above table, node 1 and node 2 have the same network address, which means these
nodes belong to the same network.
CIDR, or classless interdomain routing, is used to assign IP addresses that do not use classes. IP
addresses that use classes are separated into blocks according to network IDs and host IDs, resulting
in inefficient usage of IP address space. CIDR does not use classes, so IP address space can be
divided as required to more efficiently use IP address space. For example, using a subnet mask setting
with CIDR enables building a horizontally distributed network exceeding 254 nodes even if a class C
address block (e.g., 192, 168...) is used.
4-1-4 CIDR
Subnet Mask Range
192.0.0.0 to 255.255.255.252
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