Labs & Tools
Free browser-based calculators and reference tools covering Networking, Security, Cloud, and more. No install, no account, instant results.
Networking
Subnetting, CIDR, addressing, OSI model, and port reference — essential for CCNA, Network+, and cloud exams.
Subnet Calculator
IP + CIDR or subnet mask → network, broadcast, hosts, wildcard
IP Binary Converter
Dotted decimal ↔ binary — with bit-by-bit breakdown
CIDR Reference Table
Every CIDR prefix from /1 to /32 — mask, wildcard, host count
Wildcard Mask Calculator
Subnet mask → wildcard mask for Cisco ACLs and routing protocols
VLSM Calculator
Base network + host requirements → efficiently allocated VLSM subnets
TCP/UDP Port Reference
Search 90+ well-known ports by name, number, or protocol — with exam context
OSI Model Reference
Click any layer → PDU, protocols, devices, and exam tips
IPv6 Address Tool
Expand, compress, and identify any IPv6 address type
Security
Password analysis, encryption algorithms, and security concepts for Security+ and CISSP.
Cloud
AWS service reference and cloud architecture tools for AWS CLF and SAA.
General
Number system conversion and cross-exam tools for A+, Security+, and networking exams.
Ready to test your knowledge?
Use these tools to build understanding, then practice with real exam-style questions.