Hello everyone. So in this video
we are going to see how to perform a fast
port scan.
So the syntax of doing this scan is nmap the
target IP address hyphen capital
F to do the fast port scan and
hyphen V to see the output in verbose mode.
So you can scan a Target Port number using
the fast port scan and nmap will
automatically start scanning for the TCP and
UDP ports.
Remember here if you use a fast port scan,
then unmap will automatically scan for
hundred ports.
But the default scan scans for
top 1000 ports.
Also, you can add a hyphen V to see the verbose output.
The example is shown over here and map
the IP address that you want to scan and hyphen f
to perform a fast port scan.
So, let's see this port as you can see on my
terminal. I'm going to type the command and map.
the target IP address
followed by hyphen capital f
as you can see the scan has been successfully completed
and I have identified that three
ports are open.
If you look closely not shown 97 close
ports, which means only top 100
ports were scanned.
So let us try to scan.
this time
this host which is google.com.
And you can see we have found that two ports are
open which is Port 80 and Port
443 which is https and
http.
So now let us try to scan the scan me
dot nmap.org domain.
And here we find out that these are
the status for the port numbers.
so from the top
100 ports 59 are closed and
rest of them are open.
So I hope you guys understood this.
If he had a hyphen hyphen open when then we will
only be able to see the open ports into that
host. So as you can see, there are only
two open ports in
the top 100 ports.
Perfect. So I hope you guys understood how to perform a
fast port scan. Thank you.