Nmap Cheatsheet for Hackers

This content originally appeared on DEV Community and was authored by Rocky sah

🎥 Nmap Basics for Hackers: Watch the video

Nmap (Network Mapper) is one of the most powerful tools for network scanning and reconnaissance. Whether you are a penetration tester, bug bounty hunter, or cybersecurity enthusiast, mastering Nmap can give you an edge in discovering vulnerabilities and mapping network infrastructures.

🔹 Basic Scanning Commands

Scan a single IP

   nmap 192.168.1.1

Scan a range of IPs

   nmap 192.168.1.1-100

Scan an entire subnet

   nmap 192.168.1.0/24

Scan a specific port

   nmap -p 22 192.168.1.1

Scan multiple ports

   nmap -p 22,80,443 192.168.1.1

Scan all 65535 ports

   nmap -p- 192.168.1.1

🔹 Host Discovery

Ping Scan (Discover live hosts without scanning ports)

   nmap -sn 192.168.1.0/24

Disable host discovery (Scan only specified targets)

   nmap -Pn 192.168.1.1

🔹 Advanced Scanning Techniques

Service and version detection

   nmap -sV 192.168.1.1

Operating system detection
```
nmap -O 192.168.1.1
```
Aggressive scan (OS detection, version detection, script scanning, and traceroute)
```
nmap -A 192.168.1.1
```
Scan a target behind a firewall
```
nmap -sS 192.168.1.1
```

🔹 Script Scanning

Use default scripts
```
nmap -sC 192.168.1.1
```
Use specific scripts (e.g., to detect vulnerabilities)
```
nmap --script=vuln 192.168.1.1
```
Run multiple scripts
```
nmap --script=ftp*,http* 192.168.1.1
```

🔹 Performance Optimization

Increase speed (Use higher timing templates)
```
nmap -T4 192.168.1.1
```
Maximum speed (Be cautious, may be detected by IDS/IPS)
```
nmap -T5 192.168.1.1
```

🔹 Firewall Evasion & Stealth Scanning

Fragment packets (Bypass simple packet filters)
```
nmap -f 192.168.1.1
```
Decoy scan (Make it appear as if multiple hosts are scanning)
```
nmap -D RND:10 192.168.1.1
```
Spoof source IP
```
nmap -S 192.168.100.100 192.168.1.1
```
Use custom packets
```
nmap --data-length 50 192.168.1.1
```

🔹 Output and Reporting

Save scan results to a text file
```
nmap -oN scan_results.txt 192.168.1.1
```
Save results in XML format
```
nmap -oX scan_results.xml 192.168.1.1
```
Save results in all formats
```
nmap -oA scan_results 192.168.1.1
```

🔹 Conclusion

Nmap is an essential tool for cybersecurity professionals. Whether you are conducting penetration testing, vulnerability assessments, or ethical hacking, understanding Nmap’s powerful features will enhance your reconnaissance skills.

📌 Watch the Nmap Basics for Hackers video to get a practical walkthrough and start using Nmap effectively!

🚀 Happy Hacking! 🔥

This content originally appeared on DEV Community and was authored by Rocky sah

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Rocky sah | Sciencx (2025-03-15T04:02:01+00:00) Nmap Cheatsheet for Hackers. Retrieved from https://www.scien.cx/2025/03/15/nmap-cheatsheet-for-hackers/

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