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So, now you don't only have to scan devices on your local network, you can also scan external IP addresses or host names. So, I'm going to scan my server here by typing "nmap pointybracket.net" and then the host name of my server. It's gonna take a moment and I've got a lot of open ports just because I have so many different things running. I've got, there's a lot of things that run on it and some things that I just setup that I've never really used and haven't bothered to shut them down, and so what we get here is my host and we can see that I've got FTP, SSH, SMTP, we've got the standard domain in HTTP, pop3, there's a bunch of stuff here and I'm not going to go into what all those are but we can see that these are everything that the server has. You can also set a file, so let me clear this. Let's open up gedit. So, we're going to create a file of of hosts that we want to regularly scan and this can save time when we scan them if you've got like you know a few hosts that you regularly check on. So, I'm going to put "pointybracket.net" "192.168.0.1" and "192.168.0.100" and I'm gonna save this as "networks.txt" So, what we can do there is we can type "nmap -iL -/networks.txt." so it's a lowercase "i" and a capital "L" and then the location of that file, so it was "networks.txt" in my home directory. This is going to scan each of the hosts that is in that networks file. It returns in the order that they were scanned in, so that's pretty neat. I want to go over a few more things with you guys regarding this command it does get pretty big there's so much so that you can do with this, and so I really urge you guys to go and explore this if networking is one of your interests, if you want to really you know follow that. One of the things I want to show you guys is how we can turn on OS inversion detection during the scan, and so what we're going to do is type "nmap -A 192.168.0-100" and this is going to scan, oh I had a little typo in the IP address there so I had just fix that, so this should tell me the operating system versions that are running on the devices on my network, and you can also find this information about other hosts. Aside from this, just while this is running you can scan aa network and find out which servers and devices are up and running by using the flag "-sP" You can display the reason that a port is in a particular state by having the flag "--reason" You can choose to only show opened ports which appears to be the default functionality here, it doesn't show the closed ports. You...