1
00:00:01,260 --> 00:00:04,410
Now let's see another command and let's look up.

2
00:00:05,860 --> 00:00:08,300
OK, that is name server lookup.

3
00:00:08,970 --> 00:00:14,570
We use it to find out the information about domain name system of our target.

4
00:00:15,000 --> 00:00:21,580
Right now, if I type and look up and hit enter, it's showing the default server.

5
00:00:22,140 --> 00:00:24,570
OK, that is Delacey and his daughter Gonadotropin.

6
00:00:25,380 --> 00:00:28,500
So Ticona is my Internet service provider.

7
00:00:29,200 --> 00:00:32,340
OK, and this is the default IP address.

8
00:00:32,910 --> 00:00:40,310
OK, now if you remember, we have got the same IP address on our previous experiment.

9
00:00:40,320 --> 00:00:42,810
That is when we are tracing route.

10
00:00:43,230 --> 00:00:46,520
OK, see this for the no IP address.

11
00:00:46,530 --> 00:00:49,260
This is same as this one.

12
00:00:50,160 --> 00:00:55,590
OK, so this is the name server for my computer.

13
00:00:55,740 --> 00:00:59,670
OK, now let's try this on our target.

14
00:00:59,790 --> 00:01:01,470
That is Facebook dot com.

15
00:01:08,040 --> 00:01:08,490
OK.

16
00:01:11,360 --> 00:01:14,780
Now, let's try this on another Web site.

17
00:01:21,710 --> 00:01:28,010
See, this is the domain name and it is protected by CloudFlare.

18
00:01:28,850 --> 00:01:33,580
OK, so we are getting the DNS information here.

19
00:01:35,750 --> 00:01:36,130
Right.

20
00:01:39,230 --> 00:01:44,610
Now, let's try to find out something that is canonically.

21
00:01:45,560 --> 00:01:52,700
Now, you might be thinking, what is the name C. Suppose there are two domain names, Facebook dot

22
00:01:52,700 --> 00:01:57,250
com and www.youtube.com pointing towards the same application.

23
00:01:57,530 --> 00:02:08,420
So instead of maintaining two different records for DNS, what we can do is we can set a record for

24
00:02:08,990 --> 00:02:15,710
Facebook dot com, which is pointing towards the server IP address.

25
00:02:16,320 --> 00:02:29,300
OK, and we will say C name record for the blue dot Facebook dot com pointing towards Facebook dot com.

26
00:02:30,470 --> 00:02:35,870
OK, so if user on any of these it will relate to the same Web site.

27
00:02:36,670 --> 00:02:40,250
OK, so this is what a C name is.

28
00:02:40,490 --> 00:02:43,250
Now let's see how to do this in practical.

29
00:02:43,860 --> 00:02:52,370
So set by the ceiling and let's type our target.

30
00:02:55,820 --> 00:03:00,680
OK, so again, a middle name for Facebook is STOD Mini and this.

31
00:03:02,560 --> 00:03:11,910
Right, and this is the other information that is the default server of my Internet service provider,

32
00:03:12,070 --> 00:03:16,510
so NSA, look up, help us to determine information about domain name system.

33
00:03:17,560 --> 00:03:17,940
OK.