Subnet Calculator

IPv4 CIDR math — network, broadcast, usable range, and every mask format.

Runs locally — nothing you enter leaves your device

IPv4 address and subnet

Use CIDR notation, or an IP followed by a dotted netmask.

Results

Network address —

Broadcast —

First usable host —

Last usable host —

Usable hosts count —

Netmask (dotted) —

Wildcard mask —

Prefix —

IP class and scope —

Enter an IPv4 subnet to calculate its range.

Binary view

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