Would you like to inspect the original subtitles? These are the user uploaded subtitles that are being translated: 1 00:00:00,450 --> 00:00:02,970 And map subnet scanning. 2 00:00:02,970 --> 00:00:08,940 So earlier we learned our own IP with a command if config and we scanned. 3 00:00:08,940 --> 00:00:13,290 So how can we scan all the other eyepiece on our network. 4 00:00:13,320 --> 00:00:15,470 In fact there are two different ways. 5 00:00:15,480 --> 00:00:23,950 First we can write all of the threads one by one so that means one by one on the command line and map 6 00:00:24,250 --> 00:00:36,230 10 0 dot to 1 and map 10 0 dot to dot to dot three all the way up to 255. 7 00:00:36,280 --> 00:00:40,340 So as you can see this process will take quite a while. 8 00:00:40,390 --> 00:00:50,600 So instead we can use a shorter and easier and map search we scan the IP information by subnet so for 9 00:00:50,600 --> 00:01:01,520 this will type and map 10 dot 0 got to dot 0 slash 24 and press enter in that way and map will scan 10 00:01:01,670 --> 00:01:08,960 all the threat from 10 dot zeroed out to about one all the way through ten dot Zero Dark two dot 255 11 00:01:09,260 --> 00:01:12,300 in sequence OK. 12 00:01:12,320 --> 00:01:24,120 So when do we talk about a subnet what is subnet so we've already said that ropes can be between 0 and 13 00:01:24,120 --> 00:01:32,240 255 so let's talk a little bit more about this subnet or sub network is a logical subdivision of an 14 00:01:32,240 --> 00:01:40,200 IP network the division of a network into two or more networks is called a subnet so computers belonging 15 00:01:40,200 --> 00:01:45,240 to a subnet are treated with the same bit group in their IP address. 16 00:01:45,240 --> 00:01:52,860 And what this does is results in an IP address logically divided into two fields the network number 17 00:01:52,890 --> 00:02:01,510 or routing prefects and the remaining field or host identifier of the rest of field is an identifier 18 00:02:01,510 --> 00:02:04,900 for a specific host or network interface. 19 00:02:06,340 --> 00:02:13,330 The routing prefix can be expressed in the classless cross domain routing or S.L. TR representation 20 00:02:13,660 --> 00:02:19,060 which is written as a first address of a network and then ends with the forward slash character and 21 00:02:19,270 --> 00:02:28,920 the prefix bit length for example 10 does 0 2 does 0 slash 24 is a prefix of the Internet Protocol Version 22 00:02:28,920 --> 00:02:37,950 for network starting at the given address with 24 bits allocated for the network prefix and 8 bit reserved 23 00:02:37,950 --> 00:02:45,510 for host addressing so addresses in a range of 10 to zeroed out to date zero to 10 zeroed out to dot 24 00:02:45,520 --> 00:02:55,850 255 belong to this network for IP for network can also be characterized by subnet mask or net mass. 25 00:02:55,920 --> 00:03:04,070 So this is a bit mask which is bit wise to any IP on a network and one applied by the process. 26 00:03:04,080 --> 00:03:12,100 It gives the routing prefix the subnet mass is also expressed in dotted decimal notation such as an 27 00:03:12,100 --> 00:03:23,050 address for example 255 255 255 does zero that's the subnet mask for the prefix 10 dads zero 0 2 0 slash 28 00:03:23,050 --> 00:03:24,370 24. 29 00:03:24,610 --> 00:03:34,470 So when all virtual machines Kelly Linux log in open terminal and map then dot zero dot two dot zero 30 00:03:34,470 --> 00:03:39,040 size 24 and press enter and what do you see here. 31 00:03:39,280 --> 00:03:48,490 All the IP is in the network Ten dot 0 2 0 slash 24 were scanned one by one and the results are listed. 3830