Add IPv4 address
This allows you to add an IP address/address range/subnet of a remote point to which a rule is applied. Internet Protocol version 4 is the older but still the most widely used.
Single address – Adds the IP address of an individual computer for which the rule is to be applied (for example 192.168.0.10).
Address range – Enter the starting and ending address IP address to specify the IP range (of several computers) for which the rule is to be applied (for example 192.168.0.1 to 192.168.0.99).
Subnet – Subnet (a group of computers) defined by an IP address and mask.
For example, 255.255.255.0 is the network mask for the 192.168.1.0/24 prefix, that means 192.168.1.1 to 192.168.1.254 address range.