Subnet Calculator
Network address, broadcast address, subnet mask, wildcard mask and usable host range for any IPv4 CIDR.
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About this calculator
Everything that follows from an IPv4 address + CIDR prefix — including the /31 and /32 edge cases most calculators get wrong.
Network vs. broadcast vs. usable hosts
The first address is the network address, the last is broadcast — neither is assignable. That's why a /24 has 256 total but only 254 usable hosts.