Subnet / CIDR Calculator

Enter an IPv4 address with a CIDR prefix (e.g. 192.168.1.5/24) to instantly get the network address, broadcast address, subnet mask, usable host range and host count. Fully calculated in your browser.

🔒 Privacy: all processing happens locally in your browser. Nothing is uploaded.

IP address / prefix (CIDR)

Prefix length

CIDR

192.168.1.0/24

Network address

192.168.1.0

Broadcast address

192.168.1.255

Subnet mask

255.255.255.0

Mask (hex)

0xffffff00

Wildcard

0.0.0.255

First usable host

192.168.1.1

Last usable host

192.168.1.254

Usable hosts

254

Binary view

IP: 11000000.10101000.00000001.00000101
Network address: 11000000.10101000.00000001.00000000
Subnet mask: 11111111.11111111.11111111.00000000

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