[Day 10] 2. nmap

Overview

Nmap (Network Mapper) is a powerful open-source tool used for:

• Network exploration
• Security auditing
• Fingerprinting (Identifying devices and services on a network)

How to Learn About Any Tool:

1. Check the manual (e.g.,
   Copy

   man nmap

   )
2. Explore online documentation (official websites, forums, etc.)
3. Use cheat sheets (available online for quick reference)

Common Nmap Commands:

1. Scan a single target with detailed information:

   bashCopy
   sudo nmap -A -T4 <target_ip>
   

   • Copy

     -A

     : Enables OS detection, version detection, script scanning, and traceroute.
   • Copy

     -T4

     : Optimizes speed for scanning (use
     Copy

     -T5

     for faster but riskier scans).

2. Scan an entire network (including all devices in the range):

   bashCopy
   sudo nmap -A -T4 <target_network_with_netmask>
   

   • This will scan all devices within the specified network range.

Important Note:

• Do not run Nmap scans on websites or networks you do not have explicit permission to test. Unauthorized scanning may be illegal and result in penalties.