Why Scan Your Network?
Network scanning helps you understand what's connected, what's exposed, and what vulnerabilities exist. Attackers scan networks - you should too, but first.
Legal Warning
Only scan networks you own or have explicit permission to test. Unauthorized scanning is illegal.
Essential Tools
| Tool | Purpose | Skill Level |
|---|---|---|
| Nmap | Port/host scanning | Intermediate |
| Wireshark | Packet analysis | Intermediate |
| Angry IP Scanner | Simple host discovery | Beginner |
| Fing | Mobile network scanner | Beginner |
| Nessus | Vulnerability scanning | Advanced |
Nmap Basics
nmap-commands
# Discover hosts on network
nmap -sn 192.168.1.0/24
# Scan common ports
nmap -sV 192.168.1.1
# Full port scan
nmap -p- 192.168.1.1
Wireshark
The gold standard for packet analysis:
- Capture all network traffic
- Deep protocol inspection
- Filter by IP, port, protocol
- Follow conversation streams
- Export for analysis
Home Network Use
For home users, simpler tools work great:
- Fing (mobile) - See all devices on your WiFi
- GlassWire - Monitor network activity
- Router admin page - Check connected devices