at 21:26 Completed Parallel DNS resolution of 1 host. Starting Nmap 7.01 ( ) at 21:26 CET Initiating Ping Scan at 21:26 Scanning 192.168.5.102 Completed Ping Scan at 21:26, 0.01s elapsed (1 total hosts) Initiating Parallel DNS resolution of 1 host. You can also enable the verbose mode using the -v flag to detect additional host information: nmap -v -O 192.168.5.102 Nmap done: 1 IP address (1 host up) scanned in 50.64 seconds Not shown: 999 filtered ports PORT STATE SERVICE 443/tcp open https Warning: OSScan results may be unreliable because we could not find at least 1 open and 1 closed port Device type: general purpose Running: Linux 2.4.X OS CPE: cpe:/o:linux:linux_kernel:2.4.37 OS details: DD-WRT v24-sp2 (Linux 2.4.37) Starting Nmap 7.01 ( ) at 21:24 CET Nmap scan report for 10.0.0.50 Host is up (0.0090s latency). Cisco devices, Juniper switches): nmap -O 10.0.0.50 Nmap will even recognize network device (e.g. In the output above you can see that Nmap has successfully recognized the operating system on the target host (it is indeed Windows Server 2012). Nmap done: 1 IP address (1 host up) scanned in 153.47 seconds OS details: Microsoft Windows 7 or Windows Server 2012, Microsoft Windows XP SP3 OS CPE: cpe:/o:microsoft:windows_7 cpe:/o:microsoft:windows_server_2012 cpe:/o:microsoft:windows_xp::sp3 To enable operating system detection, use the -O flag. Nmap includes a huge a database of the most common operating system fingerprints and can identify hundreds of operating systems based on how they respond to TCP/IP probes. Nmap is known for having the most comprehensive OS fingerprint database and functionality. Detecting the operating system of a host is essential to every penetration tester for many reasons – including listing possible security vulnerabilities, determining the available system calls to set the specific exploit payloads, and other OS-dependent tasks. Nmap is often used to detect the operating system a host is using.
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