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Hello, my name is Stephan, and in this lecture we will learn how to scan random targets on the internet

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and Nmap.

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A powerful network scanning tool, offers a fascinating feature that allows researchers to conduct scans

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against random targets on the Internet.

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Although it's important to note that aggressive scanning without permission is not recommended and may

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be illegal in certain countries, and generating a sample of random hosts can be valuable for research

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purposes related to publicly accessible hosts.

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So let's explore how to generate random hosts as targets for Nmap scans.

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So to generate a list of n random target hosts, you can use this Nmap command Nmap lowercase e uppercase

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L here.

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So we will do 20 here and now.

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Here we are generating 20 random hosts.

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So here, let's actually wait.

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And here.

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And here, as you can see here, we scanned randomly and there is zero hosts up.

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So now let's delve into the prevalence of ICMP Internet control message protocol on remote servers.

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And we will launch a host discovery scan against three random targets.

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So Nmap is n.

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So this is a host discovery and lowercase E uppercase R and we will do three here and here.

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The scan results will display information about a scan and host.

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In this case there is a zero hosts up, so let's actually make it 50 so we will have more chance to

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get the online hosts here and here you can use the arrow keys to see the.

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A percentage of the process.

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And here it's 9400.

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And as you can see here, there's a three hosts up.

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And here I can make a technologies.com and so on.

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So the scan results will display information about the scanned host, such as their IP addresses, responsiveness,

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their domain if they have any, and latency and this is the simple sample output that Nmap will give

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it to you.

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And let's actually learn how it works here, right?

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So by using the Nmap, lowercase and uppercase R option followed by some number here and Nmap generates

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a specified number of external IP addresses and utilizes them as a targets in the scan.

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So this target assignment can be combined with any other scan options as needed.

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So while this feature can be valuable for internet research, caution should be exercised when using

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it, and Nmap has no control over the external IP addresses.

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It generates meaning that the generated list may include critical machines under heavy surveillance.

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So keep in mind, and to evade to avoid any unintended consequences, it's important to use this feature

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responsibly and ethically.

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And there's also more here.

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So if you want to generate an unlimited number of IP addresses and run the scan indefinitely, you can

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use Nmap, lowercase, E, uppercase R here and zero option.

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For example, if you're interested here in this case, sorry, it's not zero, so zero option and here

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we will scan it indefinitely until the IP addresses end or we have some error from program.

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Right.

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And here, for example, if you are interested in finding random online dnfs here network file system

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shares, you could execute this command here Nmap.

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First we will enter the port here.

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So because NFS network file system uses 2049 for 2049 port and here we will use open and I error here.

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So here we will scan open the online machines that uses this port.

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And this port is open in that machine here.

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So we will scan it on unlimited here and here.

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As you can see here, we have like.

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Here.

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As you can see here, it's running all the way.

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So here and this is also legal issues with port scanning here.

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So it's essential to be aware of the legal implications surrounding port scanning.

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Engaging in port scanning without proper authorization is generally unwelcome and even illegal in certain

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jurisdictions.

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And before conducting any scanning activities, it's crucial to research and understand the laws and

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regulations in your local jurisdiction.

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So Nmap provides comprehensive documentation on the legal issues associated with port scanning, which

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can be found on their websites here.

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Let's actually go there so we will go nmap.org here.

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Book and legal issues dot HTML.

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So here I highly recommend that anyone considering internet wide scanning takes the time to read and

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understand these resources here.

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There is also, as you can see here, security list, security tools here.

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So there might be some error legal issues here.

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So they might be changed this link here.

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So but here you can see we also can Google it here.

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We can also DuckDuckGo it here and here.

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Nmap legal uses and here we will go to Nmap official website here and that's it.

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So yes, we need to use this here.

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So that's it.

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And as you can see here, when used properly, Nmap helps protect your network from invaders and but

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when you use improperly, Nmap can in rare cases of course get you sued, fired, expelled, jailed

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or banned by your Internet service providers.

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So reduce your risk by reading this legal guide before launching Nmap here.

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So there's a here as you can see, there's a port scanning is not crime and the strong opinions on a

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port scanning legality and morality.

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And here, as you can see here, I love BMW they're nice car here M3, I think.

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Yes.

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And here you have you can read all of this chapter to understand the legal uses that comes with scanning

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ports here.

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So I'm waiting you in next lecture.