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Work out the network, broadcast address, host range and masks for any IPv4 address. Everything runs in your browser.
Enter an IPv4 address and prefix to get the network, broadcast, host range, and masks.
The first and last address of the subnet and the usable host range between them.
Subnet mask, wildcard mask, CIDR prefix and the number of usable hosts.
The math runs in your browser. Nothing you type is sent to our servers.
Straight answers about your results.
CIDR writes an address and its network size together, like 192.168.1.0/24. The number after the slash is how many bits belong to the network.
A /24 has 256 addresses. Two are reserved for the network and broadcast addresses, which leaves 254 usable hosts.
It’s the subnet mask flipped. Routers and firewalls use it to match a range of addresses.
No. The calculator runs in your browser, so the addresses you enter never leave your device.
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