Nmap¶
Nmap is a network discovery and security auditing tool. Use it only against systems you own or are explicitly authorised to test.
Authorisation required
Scanning someone else’s infrastructure without permission can be unlawful and disruptive.
Basic scan¶
nmap 192.0.2.10
Service detection¶
nmap -sV 192.0.2.10
All-port scan¶
nmap -p- 192.0.2.10
Common options¶
| Option | Purpose |
|---|---|
-sV |
Probe for service versions |
-p- |
Scan ports 1–65535 |
-Pn |
Treat host as online (when discovery is blocked) |
-oN file.txt |
Save normal output |
Example output¶
PORT STATE SERVICE VERSION
22/tcp open ssh OpenSSH 9.6
80/tcp open http nginx