Hacking, computer security: use of the "nmap" tool

Nmap is a tool to scan and analyze a host, this is one of the most important steps for a hacker. Today we will see how to use it.

ALSO READ: 7 pentesting tool Ubuntu, how to install them

Let's start with a simple scan, then type

nmap --version-light www.google.com

this is the result:

Nmap

as we can see from the photo, it has scanned the other hosts related to Google and its open ports, the latter are an important point for a hacker, but to proceed he also needs to know the system that the victim is using, for this it is use the -A option

quindi

nmap --version-light -A www.google.com

nmapA

we can see the "Service Scan", the OS that Google uses is Linux (linux_kernel), now let's see how to do an in-depth (almost) maximum scan, we're going to scan all the TCP / UDP ports, the services and what we've seen so far, I state that we can wait even longer than 5 minutes (even if on Google servers I don't think it has much effect, but it's a demonstration)

the command to write is:

nmap --version-all -p 1-65535 -A www.google.com

Here's how an nmap command is structured (you need an average knowledge of the Linux terminal)

nmap <options> <target>

Available Options:

nmap <[options :-p -T4 --version-light -A -O --version-all (these are only the main ones, type --help to display them all) (obviously you can use multiple options simultaneously)]> < [target: www.sito.it/XXX.XXX.XX.X]>

the result will be

nmap --versionò-light -A www.sito.it

Guide for information purposes, penetrating / attaching a computer system (Desktop PC, Laptop, Mainframe, smartphone) is punishable by law, if not granted by the owner!

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