1
00:00:01,230 --> 00:00:08,490
Now let's see another command and s lookup that is name server lookup.

2
00:00:08,910 --> 00:00:14,730
We use it to find out the information about domain name system of our target.

3
00:00:14,970 --> 00:00:23,460
Right now, if I type in this lookup and hit enter, it's showing the default server that is del cns

4
00:00:23,470 --> 00:00:24,720
dot dot in.

5
00:00:25,290 --> 00:00:33,420
So the Kona is my internet service provider and this is the default IP address OC.

6
00:00:33,780 --> 00:00:40,290
Now if you remember, we have got this same IP address on our previous experiment.

7
00:00:40,290 --> 00:00:46,500
That is when we are tracing a route OC see this for the number IP address.

8
00:00:46,500 --> 00:00:50,760
This is same as this one OC.

9
00:00:51,600 --> 00:00:56,310
So this is the name server for my computer OC.

10
00:00:57,000 --> 00:00:59,730
Now let's try this on our target.

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00:00:59,730 --> 00:01:01,590
That is facebook dot com.

12
00:01:11,320 --> 00:01:14,920
Now let's try this on one another website.

13
00:01:21,690 --> 00:01:28,200
See, this is the domain name and it is protected by Cloudflare.

14
00:01:29,190 --> 00:01:33,780
So we are getting the DNS information here.

15
00:01:35,780 --> 00:01:36,320
Right.

16
00:01:39,210 --> 00:01:44,820
Now let's try to find out C name that is canonical name.

17
00:01:45,480 --> 00:01:48,990
Now you might be thinking what is seen in C.

18
00:01:49,860 --> 00:01:56,250
Suppose there are two domain names, facebook dot com and w w w dot facebook.com pointing towards the

19
00:01:56,250 --> 00:01:57,390
same application.

20
00:01:57,390 --> 00:02:08,610
So instead of maintaining two different records for DNS, what we can do is we can set a record for

21
00:02:08,940 --> 00:02:22,440
Facebook dot com, which is pointing towards the server IP address and we will set C name record for

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00:02:22,800 --> 00:02:29,460
w w w dot facebook dot com pointing towards facebook dot com.

23
00:02:30,930 --> 00:02:36,030
So if user run any of these, it will redirect it to the same website.

24
00:02:38,040 --> 00:02:40,410
So this is what a C name is.

25
00:02:40,410 --> 00:02:43,440
Now let's see how to do this in practical.

26
00:02:43,740 --> 00:02:52,530
So set type two C name and let's type our target.

27
00:02:56,150 --> 00:03:00,920
So again, a new name for Facebook is start meaning and this.

28
00:03:02,540 --> 00:03:03,140
Right.

29
00:03:03,560 --> 00:03:11,960
And this is the other information that is the default server of my Internet service provider.

30
00:03:11,960 --> 00:03:16,640
So this lookup helps us to determine information about domain name system.