Communication solutions for power utilities
UNIVERSAL TELEPROTECTION TPU-1
INSTALLATION AND COMMISSIONING MANUAL Web version TPU-1R - Rev. 5.9 (May 2018)
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There are three classes of IP addresses, class A addresses, class B addresses and class C
addresses. These classes are distinguished by the number of bits devoted to the network
number and the host number, as shown in Figure 35.
Figure 35 Classes of IP addresses
In IP addresses, it is possible to use the bits devoted to the host number to create
subnetworks, justifying the existence of subnet masks, which are used to identify the
network number and the host number of an IP address and have the same format (32 bits).
Given an IP address and a subnet mask, by performing an AND logical operation between
them both, the part of the IP address that corresponds to the network is determined, and
also the part that corresponds to the host, as shown in Figure 36.
Figure 36 IP address and subnet mask
