Free IP Subnet Calculator Online - CIDR & Network Mask Tool 2026

Calculate network subnets, CIDR, broadcast addresses, and usable IP ranges instantly in your browser. The best free IPv4 subnet calculator for network engineers.

Configuration

IP Address (IPv4)

Subnet Mask / CIDR

Subnet Details

Network Address192.168.1.0

Broadcast Address192.168.1.255

Subnet Mask255.255.255.0 (/24)

Usable Host Range192.168.1.1 - 192.168.1.254

Total Number of Hosts256

Number of Usable Hosts254

How to Use

Enter a valid IPv4 address (e.g., 192.168.1.10) into the input field.

Select or enter your desired CIDR notation or Subnet Mask (e.g., /24).

Our free IP subnet calculator will instantly process the network details.

View the calculated Network Address, Broadcast Address, and total Usable Host IP Range.

Copy any of the results securely for your network configuration, router setup, or IT exam preparation.

Features

Instant CIDR to Subnet Mask conversion algorithm

Accurately calculates Network and Broadcast IP addresses

Shows precise Usable Host IP range and total host count

100% Client-side processing: Your IP data is never sent to any server, ensuring total privacy

Supports all IPv4 classes (A, B, C) and complex subnets (/0 to /32)

Fastest and most responsive UI for IT professionals in 2026

FAQ

Are you designing a complex network or studying for your CCNA certification? Our free online IP Subnet Calculator is the ultimate tool for network engineers, sysadmins, and IT students in 2026. Instantly calculate subnet masks, CIDR blocks, usable IP host ranges, network addresses, and broadcast addresses with pinpoint accuracy. Unlike other tools that send your data to remote servers, our highly optimized subnetting calculator processes everything securely in your browser for unmatched speed and privacy. Whether you're configuring a home router, setting up enterprise VLANs, or deploying cloud VPCs, this free network mask tool provides the exact data you need.

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