IT Tools, Built for IT Professionals
Practical, no-signup tools to help you plan, calculate and make smarter IT decisions — built by the Decoding IT team.
IP Subnet Calculator
Calculate subnet masks, network addresses, broadcast addresses and usable host ranges for any CIDR block instantly.
M365 License Cost Estimator
Compare Microsoft 365 plans and estimate total monthly and annual licensing costs across your entire user base.
Downtime Cost Calculator
Quantify the real financial impact of IT downtime — factor in lost revenue, staff productivity and recovery costs.
Backup Storage Calculator
Estimate your backup storage needs based on data size, retention period, daily change rate and compression ratio.
Windows Server License Calculator
Estimate Windows Server core licenses and CALs — Standard vs Datacenter, virtualization rights and CAL requirements explained.
Server Cost Calculator
Estimate server hardware pricing from CPU, RAM, and storage sizing — reference pricing only, refreshed monthly.
Patch Tuesday Tracker
See every CVE Microsoft patched this month — severity, exploit status and affected products, live from the official Security Update Guide.
Email Security Checker
Check any domain's SPF, DKIM, DMARC, MTA-STS and BIMI records instantly — see exactly what's stopping attackers from spoofing your email.
Password Strength & Breach Checker
Check a password's strength and see if it has already appeared in a known data breach — scored entirely in your browser, nothing is ever sent to a server.
Phishing Email: Spot the Difference
Click the red flags in five realistic fake emails — a free, interactive way to train your eye (and your team) to catch phishing before it costs you.
Ransomware Readiness Quiz
A 12-question checklist across backups, access control, patching, endpoint protection, email security and incident response — scored into a readiness grade with what to fix first.
Website Security Checker
Check any website's HTTPS setup, security headers, exposed config files and cookie flags in seconds — free, no signup.
More tools on the way
We're building more free tools for IT teams. Check back soon — or let us know what you need.