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All right.

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Welcome back.

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Let's continue with our port scanner.

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What would it be now.

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As you can see from the previous video we only discovered that the port 80 is open on the website that

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we scanned.

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So what we need to do now is we need to wrap this code inside of a function.

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Now let me show you why we are doing that.

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If I simply define a function which will be called scan underscore port.

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And for those of you who don't know to define the function you simply just type def and then the function

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name this function will take two parameters which will be the IP address which when defined at the beginning

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of the program.

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And it will also be a port.

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OK.

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We specify two dots.

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And now we need to tap all of this code in so it can belong to the function that we created.

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OK.

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So here it is.

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What this function will do is it will scan the port and it will define whether it is open or closed

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now.

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Another thing that we want to do is we don't really want the ports to be already predetermined for example

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let's say that the user of this program wants to scan port 22 which is the a safe port.

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Well we want to allow them to actually do that.

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So we need to remove this port equals eighteen and also from these comments right here we want to pipe

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port and then we are going to type it like this plus string from the port.

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And the reason why we're using the string function onto this port variable is because the port variable

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will hold an integer value.

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Therefore once we actually try to print it we don't get an error.

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If we try to print an integer value.

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So we need to convert it first string using this SDR function and then we can print this.

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So for example in the file if the port is number 23 this will print port 23 it's open.

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We also need to do the same right here.

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If string from Port

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OK so Port 23 is closed and now let's there's no function but let's add a little bit of a twist to it.

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So what we want to do is we want to scan first 10 ports on our Web site.

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All right.

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So how can we do that.

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Well we don't have a port specified at all.

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So we need to iterate over numbers 1 10 and then specify for each number that the port is equal that

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exact number.

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Let me show you what I mean.

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So right here if I go all the way down and below the function I specify for ports in the range 1 to

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10.

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I want to perform a function scan helps underscore port on the IP address with the port number.

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So what this will do is it will go for port in range from 1 to 10.

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So first of all ports would be number one.

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We want to scan the IP address with the port equal to 1 then it will perform this task right here.

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Then it will go back.

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Change the port variable to be equal to two and then it will perform the same task just with the port

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number equal to to also what we want to do is we want to copy this copy.

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Then we can delete it and we can paste it below the function right here.

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OK.

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Now let's see whether this works.

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So once again for this feel free to scan any websites you want I will simply just go with the same Web

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site that we used in the previous video.

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And once again in order to discover the IP address of the link we simply just type and look up and then

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then the link to the actual Web site.

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Copy.

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IP address

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copied and then let's run the program.

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And third target.

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Can we select the IP address here at this and now it is scanning first then ports.

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Now right away you can notice that it's not really printing anything.

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It is actually going rather slow and it is still not even finished with the first port.

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Now we don't really want this.

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We want our port scanner to work faster so how can we fix this.

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Well first of all control C onto the program right here and then inside of our scan port function we

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need to add another line which will be

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sucked out set to time out and we want to set the time out to be equal to zero point five seconds.

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Now keep in mind also that the accuracy of the scan will depend on the length of the timeout.

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So some ports will take a longer to connect to and some ports will take less to connect to if you simply

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just leave it without the timeout.

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The accuracy will be the cost the lower the timeout the smaller the accuracy.

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But this is a price to want to pay in order to actually scan the target faster so let's see whether

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this work.

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So item 3 port scanner we paid the IP address and we can see Port 1 is closed and all of the 10 ports

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are closed on our website.

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So we scan port 1 through 10.

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OK.

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Now this is probably correct for the website the time scanning but how can we check that while in the

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previous video I scan the exact same Web site and this can deport 80.

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So how can it check whether this is working correctly.

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Well instead of the range 1 through 10 I will simply just type seventy five to eighty five and most

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likely all of the ports will be closed except the port 80.

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So let's see how this works.

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Python 3 port scanner base the IP address all the ports are closed and we have one port open and that

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is port 80.

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OK.

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So our program seems to work really well.

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OK.

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So we discovered that we need to set the time out in order to actually scan ports faster.

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We lose the accuracy but we gain on time in the next video we're going to take a look at how we can

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convert the link to an actual IP address for example we're going to take a look at how we can convert

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a link of a website to an IP address inside of our program.

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So whether the user of this program specifies a link or an IP address this will still work.

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OK.

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So I hope I see you in the next video and take care.

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By.