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How to fill in the IP address and subnet mask?

How to fill in the IP depends on your LAN. The IP currently used is IPv4. This IP resource is limited. In order to expand the utilization of resources, subnets came into being, so the IP address was changed from the original "network number+host number" to "network number+subnet number+host number". The subnet mask is to take all the bits of "network number+subnet number" as 1 and all the other bits as 0.