Free IP Subnet & CIDR Range Calculator

Calculate subnet masks, usable host IP ranges, broadcast addresses, and wildcard masks from CIDR notation.

How to use & benefits of IP Subnet & CIDR Range Calculator

Calculate IP Ranges & Subnet Masks

Subnetting divides IP networks into smaller, efficient sub-networks. Network engineers, DevOps professionals, and cloud architects rely on CIDR (Classless Inter-Domain Routing) notation to assign IP ranges for firewalls and VPCs.

Our free CIDR & subnet calculator computes network address ranges, first/last usable host IPs, broadcast addresses, and binary subnet masks instantly in your browser.

Key Benefits & Features

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Usable Host Range

Calculates exact start and end host IP addresses for any subnet block.

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Binary Conversion Table

Displays IP addresses and subnet masks in 32-bit binary notation.

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CIDR Mask Presets

Supports all IPv4 subnet prefixes from /1 to /32.

How to Use the IP Subnet & CIDR Range Calculator Step-by-Step

This utility runs entirely inside your browser using client-side JavaScript. We prioritize your security: none of your inputted text is logged or stored.

1
Input IP & CIDR: Type your IP address and select a CIDR prefix (e.g. 192.168.1.0/24).
2
Calculate Range: Click "Calculate Subnet" to process network parameters.
3
View Results: Inspect usable IP ranges, netmasks, broadcast addresses, and host counts.