Free tools
Free Networking, Security, Windows & Developer Tools
Practical networking, Windows, Microsoft 365, WordPress, and cybersecurity tools plus browser-based developer utilities. Use them in labs, help-desk tickets, and coursework—no install required.
Tip: filter by category below, or type a keyword like “mask” or “certificate”.
54 free tools
IPv4 Subnet Calculator
Free online IPv4 subnet calculator for CCNA students and network engineers. Enter an IP with CIDR or mask to get network, broadcast, and usable host ranges.
Open toolCIDR Calculator
Free online CIDR calculator for beginners, CCNA students, and network engineers. Enter IPv4 CIDR notation to get subnet mask, network, broadcast, and usable hosts.
Open toolSubnet Mask Calculator
Free subnet mask calculator for CCNA students and network admins. Convert CIDR to a dotted mask, see host counts, and calculate network and broadcast addresses.
Open toolVLSM Calculator
Free online VLSM calculator and IP subnet calculator for IPv4 CIDR. Calculate VLSM step by step, build a VLSM table, and divide networks like 192.168.100.0/24 into multiple subnets, CCNA-ready.
Open toolWildcard Mask Calculator
Free online wildcard mask calculator for CCNA students and Cisco networking. Convert subnet mask or CIDR to a wildcard mask and see ACL/OSPF examples.
Open toolIP Converter
Convert any IPv4 address between decimal, binary, and hexadecimal instantly. Free browser-based tool for subnetting practice and networking students.
Open toolIPv6 EUI-64
Free IPv6 to EUI-64 calculator. Convert a MAC address to modified EUI-64, build the fe80:: link-local address, or pull the interface ID out of an IPv6 address, CCNA-friendly and runs in your browser.
Open toolMAC Lookup
Look up the manufacturer of any device from its MAC address. Free, instant OUI lookup tool, useful for network troubleshooting and security audits.
Open toolIP Range Calculator
Free online IP range calculator for CCNA students and network engineers. Find first and last IP, usable hosts, and total addresses from CIDR or a start-end range.
Open toolNetwork Address Calculator
Free network address calculator for CCNA and IT students. Enter an IPv4 address and mask or CIDR to find the network ID, and see how it differs from host addresses.
Open toolBroadcast Address Calculator
Free broadcast address calculator for CCNA students and network admins. Find the IPv4 broadcast from an IP plus CIDR or subnet mask, and see why hosts cannot use it.
Open toolBandwidth Calculator
Free bandwidth calculator for CCNA students and network engineers. Estimate capacity from users, per-user Mbps, concurrency, and overhead, including video conferencing presets.
Open toolData Transfer Time Calculator
Free data transfer time calculator for students and engineers. Estimate how long a file takes to upload or download from size and link speed, with Mbps vs MB/s clarity.
Open toolDNS Lookup
Free online DNS lookup for CCNA students and network engineers. Check A, AAAA, MX, TXT, NS, CNAME, SOA, and CAA records for any public domain in seconds.
Open toolMX Record Lookup
Free online MX record lookup for Microsoft 365 and IT admins. See mail exchanger priorities, hostnames, and IPv4 examples for any public domain.
Open toolReverse DNS Lookup
Free reverse DNS lookup for network engineers and IT students. Find PTR hostnames for public IPv4 addresses and verify reverse DNS used in email and networking.
Open toolPort Checker
Free online port checker for CCNA students and network engineers. Test whether common TCP ports are open on a public host from the internet.
Open toolHTTP Status Checker
Free HTTP status code checker for web developers and IT support. See live status codes, redirect chains, and final URLs for any public website.
Open toolSSL Certificate Checker
Free SSL certificate checker for website owners and cybersecurity students. Inspect issuer, SANs, validity dates, and fingerprints for any public HTTPS host.
Open toolSSL Expiry Checker
Free SSL expiry checker for website owners and cybersecurity students. See how many days remain on a public HTTPS certificate before it expires.
Open toolSecurity Headers Checker
Free HTTP security headers checker for website owners and cybersecurity students. Score HSTS, CSP, X-Frame-Options, and other hardening headers on any public site.
Open toolPassword Strength Checker
Free password strength checker for cybersecurity students and website owners. Estimate strength locally in your browser—nothing is uploaded.
Open toolHash Generator
Free online hash generator for cybersecurity and programming students. Create MD5, SHA-1, SHA-256, SHA-384, and SHA-512 hashes locally in your browser.
Open toolBase64 Encoder/Decoder
Free online Base64 encoder/decoder for JavaScript, API, and web developers. Encode or decode UTF-8 text locally in your browser—no install required.
Open toolJWT Decoder
Free online JWT decoder for API developers and cybersecurity students. Inspect header and payload locally for debugging and security testing—signature is not verified.
Open toolURL Encoder/Decoder
Free online URL encoder/decoder for web and API developers. Percent-encode query text or decode %20 sequences locally without installing software.
Open toolUUID Generator
Free online UUID generator for JavaScript and API developers. Create RFC 4122 UUID v4 identifiers locally for REST APIs and web apps—no install needed.
Open toolUnix Timestamp Converter
Free online Unix timestamp converter for developers. Convert epoch seconds or milliseconds to UTC dates and back—ideal for API debugging and JavaScript labs.
Open toolJSON Validator
Free online JSON validator for JavaScript and frontend developers. Paste API responses or config files to check syntax and approximate error location—no install.
Open toolJSON Formatter
Free online JSON formatter for JavaScript and frontend developers. Pretty-print API responses with 2- or 4-space indent locally in your browser.
Open toolJSON Minifier
Free online JSON minifier for JavaScript and web developers. Remove whitespace from valid JSON locally to shrink API payloads and static files.
Open toolJSON to CSV Converter
Free online JSON to CSV converter for JavaScript developers. Turn API response arrays into spreadsheet-ready CSV locally—nested fields flatten with dot keys.
Open toolCSV to JSON Converter
Free online CSV to JSON converter for JavaScript developers. Turn spreadsheet exports into JSON arrays locally, including quoted fields with commas.
Open toolRegex Tester
Free online regex tester for JavaScript and PHP developers. Paste a pattern and sample text to validate matches in your browser—no install.
Open toolHTML Formatter
Free online HTML formatter for frontend developers and beginners. Pretty-print minified or messy HTML locally in your browser—no install.
Open toolHTML Minifier
Free online HTML minifier for frontend and web developers. Strip comments and extra whitespace locally to shrink HTML before deploy.
Open toolCSS Minifier
Free online CSS minifier for frontend developers. Remove comments and whitespace locally to shrink stylesheets—no install required.
Open toolCSS Formatter
Free online CSS formatter for frontend developers and beginners. Pretty-print minified CSS locally with clear indentation—no install.
Open toolCron Generator
Free online cron expression generator for Linux admins and DevOps beginners. Build 5-field schedules with presets and plain-English summaries.
Open toolCron Validator
Free online cron expression validator for Linux admins and DevOps beginners. Check 5-field syntax and read a plain-English schedule summary.
Open toolYAML Validator
Free online YAML validator for developers and DevOps beginners. Catch indentation and syntax errors locally before CI fails.
Open toolYAML Formatter
Free online YAML formatter for developers and DevOps beginners. Pretty-print messy YAML locally with consistent indentation.
Open toolGit Commands
Free online Git command generator for beginners and developers. Build copy-ready commands for branches, remotes, commits, and undo workflows.
Open toolWindows Error Codes
Free online Windows error code lookup for help desk and Windows 11. Search STOP, Win32, HRESULT, Update, and Event IDs with causes and next steps.
Open toolWindows Run Commands
Free online Windows Run commands finder for IT support and Windows 11. Search Device Manager, Services, Control Panel, and other Win+R tools.
Open toolPowerShell Commands
Free online PowerShell command finder for IT support and Windows 11. Search process, service, and IP commands with copy-ready examples.
Open toolWindows Shortcuts
Free online Windows keyboard shortcut finder for IT support and Windows 11. Find Task Manager, Settings, screenshot, and help desk shortcuts.
Open toolM365 License Calculator
Free online Microsoft 365 license calculator for admins and small businesses. Estimate monthly cost and compare Business, Exchange, and E3/E5 plans.
Open toolSPF Record Generator
Free online SPF record generator for Microsoft 365, Exchange Online, and small-business email. Build one valid TXT record and copy it to DNS.
Open toolDMARC Record Generator
Free online DMARC record generator for Microsoft 365 and business email. Build a _dmarc TXT record, start with p=none, and copy it to DNS.
Open toolWordPress .htaccess
Free online WordPress .htaccess generator for permalinks, HTTPS, redirects, and security rules. Copy a file you can paste without extra plugins.
Open toolWordPress Robots.txt
Free online WordPress robots.txt generator for technical SEO. Block wp-admin, allow admin-ajax, add a sitemap, and copy the file without plugins.
Open toolIT Skills Assessment
Free online IT skills assessment for beginners, students, and career changers. Score Windows, networking, security, Microsoft 365, and WordPress.
Open toolPython Interpreter
Run Python code online for free with Binary Tech's Python Interpreter. Write, execute, test, and learn Python directly in your browser without installing Python.
Open toolPreparing for an exam? Try our free IT certification practice tests.