Local browser processing
IPv4 Subnet Calculator
Calculate IPv4 network and broadcast addresses, host ranges, masks, and usable host counts instantly.
How to use IPv4 Subnet Calculator
- 1Enter an IPv4 address with optional CIDR such as 192.168.1.10/24.
- 2Review the calculated network, broadcast, and mask values.
- 3Use the host range and count to plan addresses or validate a subnet.
Key features & capabilities
CIDR notation from /0 through /32
Network and broadcast address calculation
First and last usable host addresses
Subnet mask, wildcard mask, and host counts
Frequently Asked Questions
Does it support IPv6?This tool is intentionally focused on IPv4 CIDR calculations. An IPv6 calculator should use 128-bit address handling and is planned as a separate utility.
How many usable hosts are in a /24?A conventional /24 contains 256 addresses. In a standard subnet calculation, 254 are usable host addresses because the network and broadcast addresses are reserved.
What is a /32?A /32 represents exactly one IPv4 address and therefore has one total address and no conventional host range.
About this tool
IPv4 Subnet Calculator is designed for practical everyday workflows. The interface is intentionally lightweight, responsive, and usable on desktop and mobile. The conversion or calculation runs in your browser, so ordinary input data is processed on the current device rather than uploaded as part of the tool operation.