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Free Online IT Tools

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Free Online IT Tools

Networking, security and sysadmin utilities that run in your browser

A growing toolbox for network engineers and system administrators: subnet and VLSM calculators, IP range and CIDR converters, IPv6 planning and DNS lookups, with security and server tools on the way. Every tool is free, works on any device and keeps your data in your browser.

Networking & IP5Security & CryptographysoonSysAdmin & Configurationsoon
Private by design. Calculations run locally; nothing is uploaded.
No sign-up, no limits. Free to use as often as you like.
Built by IT pros. Accurate results with clear explanations.

Networking & IP Tools

Subnetting, CIDR, IPv6 planning and DNS troubleshooting for network engineers.

IPv4 Subnet CalculatorNetwork ID, broadcast, usable host range, wildcard mask and binary breakdown for any IPv4 address.Open tool VLSM Subnet CalculatorSplit a network into variable-size subnets by host count, or into equal-size subnets.Open tool IP Range to CIDR ConverterConvert IP ranges to CIDR blocks, expand CIDRs to ranges and summarize route lists.Open tool IPv6 Subnet CalculatorExpand and compress IPv6 addresses, find the prefix range, address type and ip6.arpa zone.Open tool DNS LookupCheck A, AAAA, MX, NS, TXT, CNAME, SOA, CAA and PTR records over secure DNS-over-HTTPS.Open tool

Security & Cryptography Tools

Generate and inspect passwords, hashes, tokens and encodings safely in your browser.

These tools are in development. Bookmark this page to catch them at launch.

Password GeneratorSoonStrong random passwords and passphrases generated in your browser.
Hash GeneratorSoonMD5, SHA-1, SHA-256 and SHA-512 hashes of text and files.
Base64 Encoder / DecoderSoonEncode and decode Base64 and URL-safe Base64.
JWT DecoderSoonDecode JSON Web Token headers and claims, and check expiry.
Password Strength CheckerSoonEstimate password entropy and crack time.

SysAdmin & Configuration Tools

Linux permissions, cron schedules, timestamps and storage calculators for server admins.

These tools are in development. Bookmark this page to catch them at launch.

Chmod CalculatorSoonConvert Linux permissions between symbolic and octal notation.
Cron Expression GeneratorSoonBuild and explain cron schedules in plain English.
Unix Timestamp ConverterSoonConvert epoch time to human dates and back.
RAID CalculatorSoonUsable capacity and fault tolerance for RAID 0, 1, 5, 6 and 10.
Storage Unit ConverterSoonConvert between GB and GiB, TB and TiB, and other units.

About These Tools

How the tools work and what is coming next

Each tool page explains the concepts behind the results, with step-by-step instructions, worked examples and answers to common questions, so you can use them to learn as well as to get work done. Pair them with our networking guides, security guides and Linux & hosting guides.

Frequently asked questions

Are these IT tools free to use?

Yes. Every tool on this page is free, needs no account or sign-up and has no usage limits. They are built for network engineers, system administrators, students and anyone studying for certifications such as CCNA, Network+ or Linux exams.

Is my data sent to a server?

No. The calculators and converters run entirely in your web browser with JavaScript, so the IP addresses and values you type never leave your device. The only exception is the DNS Lookup tool, which by design sends your query directly from your browser to Google Public DNS or Cloudflare over encrypted DNS-over-HTTPS.

Do the tools work on mobile phones?

Yes. All tools are responsive and work on phones, tablets and desktops in any modern browser, including Chrome, Edge, Firefox and Safari. Each tool also has a dark mode toggle.

Which new tools are coming next?

Security and cryptography tools (password generator, hash generator, Base64, JWT decoder and password strength checker) and sysadmin tools (chmod calculator, cron expression generator, Unix timestamp converter, RAID calculator and storage unit converter) are in development and will appear on this page as they launch.

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