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Special IP addresses

(1)    Ali bits are O or 1

The IP address 0.0.0.0 is used when you do not know your own IP address or it is not necessary to inform an IP address to the target.

255.255.255.255 signifies a broadcast address (destination: all devices and PCs connected to the same network).

(2)    Loopback address

This is the address which is used between the programs executed on the same device (PLC).

The rangę is from 127.0.0.0 to 127.255.255.255.

(3)    Multicast address

This is the address used for Communications within a specific group.

The rangę is from 224.0.0.0 to 239.255.255.255.

(4)    Private address

It seems that any IP address can be used when a PC is not connected to the Internet. However, an address which can be freely assigned is designated for avoiding a trouble.

This is called a private address.

Network address (*1)	IP address rangę (*2)
10/8	10.0.0.0 to 10.255.255.255
172.16/12	172.16.0.0 to 172.31.255.255
192.168/16	192.168.0.0 to 192.168.255.255

*1 The numerical value on the right side of 7" indicates the number of bits in the network address (the bits counted from the most significant bit) shown in the high-order part of the IP address.

It contains the IP address for broadcast.