IP Subnet Calculator

Calculate IPv4 subnets, network address, broadcast address, subnet mask, wildcard mask, and usable IP host range for any CIDR prefix.

How to use this calculator

1. Enter IPv4 address.
2. Enter CIDR prefix.
3. Read network, broadcast, and host range.

Formula & method

IPv4 Subnetting

Network = IP AND Mask

32-bit binary masking.

Example

192.168.1.100/24 → 192.168.1.0 to 192.168.1.255.

Key insights

• /24 subnet provides 254 usable IPs.

How to interpret your result

Usable Range

Host IP range between network and broadcast.

Frequently asked questions

Why subtract 2?

Network and broadcast addresses cannot be host IPs.

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