Subnet Calculator

Calculate subnet mask, network, broadcast, and host range for IPv4 CIDR blocks.

IPv4 address

CIDR prefix: /24

Subnet mask: 255.255.255.0
Network: 192.168.1.0
Broadcast: 192.168.1.255
First host: 192.168.1.1
Last host: 192.168.1.254
Usable hosts: 254

Note: /31 and /32 behave differently (point-to-point and single-host). This calculator reflects that.

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