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Network · IPv4
Subnet Calculator
Calculate IPv4 subnet details from CIDR notation — network, broadcast, mask and host range.
Network
192.168.1.0Broadcast
192.168.1.255Netmask
255.255.255.0Wildcard
0.0.0.255First host
192.168.1.1Last host
192.168.1.254Usable hosts
254Total addresses
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Frequently asked
Yes — those special prefixes are handled, with usable-host counts adjusted accordingly.
No. This tool runs entirely as JavaScript in your browser — your input never leaves your device and nothing is logged.
How to use
1
Enter a block in CIDR notation (e.g. 192.168.1.0/24).
2
Read the network, broadcast, mask and host range.
3
Copy any value you need.