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What is Subnet Calculator?

Free — no account needed

Subnet Calculator is one of our Security & Privacy tools. Calculate network address, broadcast, usable hosts, wildcard mask from any IP/CIDR. Enter your numbers and the result updates as you type, with the working shown so you can check it. It runs entirely in your browser, so nothing is uploaded and no account is needed. More in this collection: Check password strength, hash files, verify URLs, scan security headers, inspect SSL certificates, look up WHOIS data, and generate privacy policies.

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How to use Subnet Calculator

  1. 1

    Open Subnet Calculator and fill in the values you already know.

  2. 2

    Read the result, which recalculates as you type.

  3. 3

    Change any input to compare scenarios side by side.

Key Features

Working shown

See how the number was reached, not just the answer.

Compare scenarios

Change any input to see how the outcome moves.

Never leaves your browser

Processing happens on your own device — nothing is uploaded to us.

Works on any device

Full functionality on phone, tablet, and desktop.

Who Is This For?

Planning a decision

Put real numbers behind a choice before committing.

Students

Check your working against a shown method.

Professionals

Produce a defensible figure in seconds.

Frequently Asked Questions

Is Subnet Calculator free?

Yes. Subnet Calculator runs in your browser and is free to use, with no account, no watermark, and no usage cap.

Do I need to create an account?

No. Open the page and use it. An account only becomes useful if you want to save tools to your own toolbox.

What happens to my data?

Subnet Calculator does its work on your own device. Your input is never uploaded to us, which is why it also works with sensitive material.

How accurate is the result?

The formula is shown alongside the result so you can verify it yourself rather than take the number on trust.

Do I need to install anything?

No. Subnet Calculator runs in the browser on desktop, tablet, and phone. There is nothing to download and nothing to keep updated.

More detail on plans is on our pricing page, and how AI-powered tools handle your data is covered on the AI processing page.

More Security & Privacy

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URL Safety Checker
Check if a URL is safe or suspicious.
Robots.txt Generator
Generate robots.txt for your website.
Privacy Policy Generator
Generate a privacy policy for your website.
Secret Store
Save and manage private URLs securely.
Secret Uploads
Upload files encrypted and stored securely.
Reverse IP Lookup
Find all domains hosted on the same IP address.
Password Hash Generator
Generate MD5, SHA-1, SHA-256, SHA-512 hashes from passwords.
Security Regex Patterns
50+ pre-built regex patterns for SQL injection, XSS, API keys, and more.
CVE Search
Search the National Vulnerability Database for CVEs by keyword and severity.
WHOIS Lookup
Look up domain registration details including registrar, creation date, and expiry.
Encoding / Decoding Swiss Army Knife
Encode and decode Base64, URL, HTML, Hex, Binary, ROT13, and ASCII formats.
cURL Command Converter
Convert cURL commands to Python, JavaScript, Java, PHP, Go, Ruby, and C# code.
Port Scanner Reference
Browse 100+ well-known ports with service names, protocols, and risk levels.
Security Header Checker
Check any website for missing HTTP security headers and get a grade from A to F.
SSL/TLS Certificate Checker
Inspect SSL/TLS certificates — issuer, expiry, SANs, protocol and key size.
Hash Identifier
Paste any hash and instantly detect its type — MD5, SHA1, SHA256, bcrypt, NTLM and more.
Security Header Generator
Configure HTTP security headers and get config for Nginx, Apache and Express.js.
Pentest Checklist
Interactive penetration testing checklist based on OWASP and PTES methodology.
Nmap Command Builder
Build nmap commands visually — scan type, ports, timing and flags.

API Keys

Generate API keys for programmatic access to AnythingText tools. Include X-API-Key header in your requests.

Generate New API Key

Your API Keys

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Quick Start

Use your API key in the X-API-Key header:

curl -X POST https://anythingtext.com/api/tools/case \
  -H "Content-Type: application/json" \
  -H "X-API-Key: atk_your_key_here" \
  -d '{"text": "hello world", "mode": "upper"}'

See API Documentation for all available endpoints.

How It Works

Three simple steps to transform your content. No signup required for most tools.

1

Choose a tool

Browse our catalog or search for exactly what you need. PDF, audio, AI, and developer tools — all in one place.

2

Upload or type

Drop a file, record audio, or paste your text directly. Most tools run in your browser — nothing to install.

3

Get results instantly

Download, copy, or share your results in seconds. Everything is fast, completely private, and free to use.