IP Subnet Calculator

Enter an IPv4 address and a CIDR prefix to see the network, broadcast, mask, usable host range and host count.

IP address

CIDR (/prefix)

Network

—

Subnet mask—

Broadcast—

Host range—

Usable hosts—

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Frequently Asked Questions

What is CIDR?

CIDR is the /prefix notation, like /24. It says how many leading bits are the network, so /24 is a 255.255.255.0 mask.

Why are usable hosts two fewer?

The network address and the broadcast address cannot be assigned to devices, so usable hosts is the total minus two.