Network
IPv4 Subnet Calculator
Calculate a network, mask, range, and host-count convention from an IPv4 address and CIDR prefix.
About this tool
When to use it
Calculate a network, mask, range, and host-count convention from an IPv4 address and CIDR prefix.
How to use it
Enter a dotted IPv4 address and a prefix from 0 to 32, then calculate. Compare network and host boundaries with your routing plan before copying or downloading the report.
Guide updated . Examples checked against this implementation.
Worked examples
A conventional /24 network
Input
192.168.1.10 with prefix 24Expected output
Network: 192.168.1.0; Broadcast: 192.168.1.255; Mask: 255.255.255.0; Usable hosts: 254The normal host range is .1 through .254. The entered address identifies the subnet even though it is not the network address.
Errors and unsupported input
Prefix 33 or octet 256Use a prefix from 0–32 and four decimal octets from 0–255. IPv6 needs a separate addressing model.
Continue this workflow
- IPv4 Range Expander: Expand a small chosen range into individual addresses.
Questions
Frequently asked questions
Are all displayed host addresses available?
No. The range is mathematical. Existing assignments and network policy determine which addresses can actually be used.