syslab:~$ learn --topic=linux,networking,cybersecurity
Learn IT and solve real problems.
SysLab gathers practical guides, learning paths and free tools about Linux, networking, servers and cybersecurity. No signup, no fluff: content designed to be useful.
Pick where to start
Four areas, all SysLab content organized within them.
Learning paths
Three full tracks, from zero to a functional level. No signup: your progress is stored only in your browser if you enable it.
Linux from scratch
Learn to navigate a Linux system with confidence: files, users, permissions, processes and basic networking concepts every sysadmin needs.
Start pathNetworking from scratch
Understand how a network is built from the IP address to routing between networks, with concepts you'll use in any professional environment.
Start pathCybersecurity from scratch
From the threat concept to practice: passwords, firewalls, scanning with Nmap, system hardening and Blue Team fundamentals.
Start pathCalculate without leaving the browser
Free tools that run entirely in your browser. No data is sent to any server.
Subnet calculator
IP + CIDR prefix → network, broadcast, mask and host range.
NetworkingCIDR calculator
Analyze any CIDR block: wildcard, total addresses and range.
LinuxChmod converter
Convert between symbolic notation (rwxr-xr-x) and octal (755).
LinuxDecimal / binary converter
Convert numbers between decimal and binary instantly.
Something not working? Start here
The most frequent errors, explained with causes, checks and fixes.