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IPv4 Subnet Calculator
Calculate the network, broadcast address and usable hosts of an IPv4 CIDR block.
What it is for?
IPv4 address, a slash, then the prefix length from 0 to 32.
What it is for?
Usable hosts
For a prefix of 30 or less, the first and last addresses are the network and the broadcast, so they are not counted as hosts. A /31 is a point-to-point link and both addresses are usable. A /32 is a single address.