Nmap
Network Scanner · Beginner
Discover hosts and services on networks you are authorized to test.
Knowledge reference only. Prefer in-browser Labs first. Use this tool only on systems you own or have written authorization to test.
What to learn
- Host discovery
- Scan types (-sS, -sT, -sU)
- Version detection
- NSE scripts
- Output formats
Legitimate use
Used by sysadmins for asset inventory and by defenders to verify firewall rules.
Official docs →Example commands (lab VMs only)
- nmap localhostScan common ports on your own machine
- nmap -sV 127.0.0.1Detect service versions on localhost
- nmap scanme.nmap.orgNmap's officially authorized test host