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In the previous video, we already learn how
to calculate total IP and subnetmask.

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Now in this video, we are going to learn about
Network IP, Broadcast IP, and IP Range.

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But we will start with Network and Broadcast
IP first.

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Okay, so what is Network IP?

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Network IP is the first IP Address in the
network.

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And Broadcast IP is the last IP Address in
the network.

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Never forget this, okay?

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Network IP is the first IP, and Broadcast
IP is the last IP.

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Now let’s remember again about the numbers
in IP Address.

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I told you in the previous video that the
number in IP Address will be always between

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0 to 255.

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So the smallest number is 0 and the largest
number is 255.

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There are impossible to have minus number
in IP Address.

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And it is also impossible to have number higher
than 255 in the IP Address.

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Let's say 256, 257, and others. That is imposible.

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The numbers will be always between 0 to 255.

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Let’s back to here.

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Remember that Network IP is the first IP Address,
and the number in the IP Address is started

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by 0, so the first IP Address must be 0.

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Okay now we have the Network IP, let’s find
the Broadcast IP.

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Remember that broadcast IP is the last IP
Address in the network.

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To calculate the Broadcast IP, we need to
pay attention at Total IP.

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In this case, the total IP is 128, so the
question is 0 to what until the total is 128?

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The answer is 127, because 0 until 127, the total
is 128.

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May be some of you little confused here, let’s try
another simpler example.

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Let’s say the total IP is 4, the first IP
or network IP must be 0 right?

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And then what is the broadcast IP?

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Here we can calculate 0 to what until the
total IP is 4, let’s write It out, 0, 1, 2,

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and then 3.

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If you see here, the total is already 4.

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Let’s say this is for computer 1, this for
computer 2, this for computer 3, and this for

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computer 4.

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So 0 until 3 is already 4.

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Let’s back to here.

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If the total IP 128, so the broadcast is 128
minus by 1, which is 127,

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This is same with this, 4 minus by 1 is 3.

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Okay I hope you understand about how to calculate
Network IP & Broadcast IP.

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But may be you have a question.

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I said before that the numbers in the IP Address
is 0 until 255,

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but here we only have until 127, why?

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In this case, this is the calculation for
the first block subnet.

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Or in the simple word, this is the calculation
for the first room.

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How about the next block subnet or the next
room?

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To calculate the next block subnet, we can
add 0 by the total IP.

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So 0 plus 128 is 128.

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This is for the second block subnet.

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To calculate next block subnet again, we can
add this 128 by the Total IP again,

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so 128 plus 128 is 256.

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But this is impossible right?

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Because the numbers in IP Address is only
between 0 until 255.

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So if we have reach 256 like this, we can
stop, because this is impossible to have next

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block subnet.

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Okay, so here, in the first block subnet or
first room.

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The network is 0, and the broadcast is 127..

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In the second block subnet or second room,
the network 128, and the broadcast is 255.

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How we get 255?

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We get this from 256 minus 1.

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This is same for 127, we can get this by 128
minus 1.

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I think this is the easiest way to calculate
Network IP and Broadcast IP.

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So first we calculate the Network IP for all
block subnet, the network in the first block

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subnet must be 0, the network in the seconds
block subnet is 0 plus by total IP,

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so we get 128.

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The network in the third block subnet is 128
plus by total IP again, so we get 256.

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And if we already reach 256 like this we can
stop.

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Now we already get Network IP for all block
subnet.

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For the broadcast IP, we can minus the next
network by 1, let’s say for the first block subnet

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the broadcast will be 128 minus by
1, which is 127.

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In the seconds block subnet, the broadcast
will be 256 minus by 1, which is 255.

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Okay I hope you now understand how to find
Network IP and broadcast IP.

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But if you still confused, don’t worry,
try to re watch this video, I believe if you

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watch this video 2 or 3 time, you will be
understand!

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But if you already watch this video 2 or 3
time and still not understand.

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You can just continue to the next video.

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After watching next video, you can back to
this video again

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and I am sure everything will be make sense!

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Okay let’s back here.

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So now for prefix /25, we have two block subnets
or 2 rooms.

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In the first room, the network is 0 and the
broadcast is 127.

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In the seconds room, the network is 128 and
the broadcast is 255.

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We can choose any block subnet to use.

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But in this case, I will use the first block
subnet.

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Okay, I think enough for this video, in the
next video we are going to learn how to calculate

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IP Range.

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Thankyou for watching and see you on the next
video!