About IPv4 Subnet & CIDR Mask Calculator
Design and audit IPv4 subnets effortlessly. Enter any IP address and CIDR prefix (/0 to /32) to calculate network address, broadcast address, first and last usable host IP range, subnet mask, total addresses, and binary bitwise visualizations.
Key Capabilities & Features
- Supports all CIDR prefixes from /0 to /32
- Calculates network, broadcast, and usable host range
- Shows subnet mask, wildcard mask, and total hosts
- Binary bit visualization of network vs host octets
- RFC 1918 private vs public IP detection
How to Use IPv4 Subnet & CIDR Mask Calculator
1
Enter IP
Type an IPv4 address (e.g. 192.168.1.1).
2
Select CIDR
Choose your subnet mask prefix (e.g. /24).
3
Review Range
Inspect usable host IP range and network parameters.
Privacy & In-Browser Execution Guarantee
All IP calculations execute locally in your browser memory.
Frequently Asked Questions
How many usable hosts are in a /24 subnet?
A /24 subnet has 256 total IP addresses, with 254 usable hosts (network address .0 and broadcast address .255 are reserved).