Free IT Study Tools
Nine free tools built for certification students: check your subnetting, design VLSM plans, and drill the ports, binary and OSI facts that CCNA, Network+, Security+ and the AWS exams test again and again. Everything runs right here in your browser — no signup, no download.
How students use these tools
Work the problem by hand first, then check it here — that order is what builds exam speed. Use the subnet calculator with our guide How to Subnet IPv4 in Under a Minute, graduate to the VLSM calculator for multi-subnet designs, keep the ports quiz, OSI quiz and acronym quiz in your daily rotation, and drill speed with subnetting practice until the answers are automatic.
Tools check your work — exams check you
When the tools feel easy, measure yourself with the free 30-question samples for every exam we cover.
Free CCNA SampleFree Security+ SampleFAQ
Are CertCrack tools really free?
Yes. Every tool on this page is free to use in your browser — no account, no download and no time limit. They are built to help you check your work while you study for exams like CCNA, Network+, Security+ and the AWS certifications.
Do the tools send my data anywhere?
No. Every calculation runs locally in your browser with JavaScript. The addresses, ports and numbers you type are never sent to a server.
Which exams do these tools help with?
The subnet, VLSM, subnetting-practice and IPv6 tools support CCNA and Network+ subnetting; the ports, OSI and acronym quizzes target Network+, Security+ and A+; the binary converter supports the number-system work behind subnetting; and the RAID calculator targets the storage objectives in A+. Free 30-question samples for each exam are linked from every tool.