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IPv4 Subnet Calculator - CIDR, Mask, Range, and Hosts

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Free Online IPv4 Subnet Calculator

Use this free IPv4 Subnet Calculator to get quick, accurate results without creating an account. The tool is designed for everyday calculations where you want the answer immediately and a clean summary you can copy.

Everything runs in your browser, so the workflow stays fast: enter the values, review the result, and keep working. The interface is intentionally simple so it works well on mobile and desktop.

Use the detailed result rows to verify the calculation and avoid common mistakes before using the output in documents, projects, planning notes, or client conversations.

Key Features

IPv4 validation
CIDR prefix input
Subnet mask output
Wildcard mask output
Network and broadcast address
Usable host range

When to Use This IPv4 Subnet Calculator

Quick daily calculations
Preparing clean numbers for notes or documents
Checking values before sharing with a teammate or client
Using a no-login browser-based utility on mobile or desktop

How to Use the IPv4 Subnet Calculator

  1. 1. Enter an IPv4 address.
  2. 2. Enter the CIDR prefix between 0 and 32.
  3. 3. Review network and broadcast addresses.
  4. 4. Check usable host range and total addresses.
  5. 5. Copy or download the subnet report.

IPv4 Subnet Calculator FAQ

Is this IPv4 Subnet Calculator free?

Yes. The IPv4 Subnet Calculator is free to use and does not require login.

Does this tool upload my data?

No. The calculation runs in your browser for a fast and private workflow.

Can I copy the result?

Yes. You can copy the result summary for notes, messages, documents, or later reference.

Does it work on mobile?

Yes. The tool is designed to work on mobile, tablet, and desktop screens.

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