Let us start classes of IP address in this lecture.
We'll discuss the five types of IP address classes.
We'll also see in detail what do these classes mean and how to get the class of an IP address just by
looking the numbers, IP addresses and address, having information about how to reach a specific host,
especially outside the LAN and IP address, the 32 bit unique address, having an address piece of goodies
232.
Generally, there are two locations in which IP addresses written doctor decimal notation and hexadecimal
notation.
Some points that need to be noted about not a decimal notation are that the value of any segment is
between zero to 255, as we have discussed in the previous lecture.
And there are no zeros preceding the value in any segment.
For example, if the number is zero five four, it should be written as Pfeifle.
So why classes of I.P. address are important, the 32 bit IP address is divided into five subclasses.
As you can see on the screen, these are Class E, Class B, Glassey, Class D and Class E.
Each of these classes has a valid ring of IP address classes.
D and E are reserved for multicast and experimental purposes respectively.
The order of the bits in the first octet determines the class of an IP address.
IP address is divided into two parts network ID that is needed and horsetail.
The class of IP address is used to determine the bits used for network idy and horsehide, each Internet
service provider or network administrator assigns IP addresses to each device that is connected to the
Internet.
Note that IP addresses are globally managed by the Internet, assigned numbers authority and A and regional
Internet registries that is are well, finding.
The total number of IP addresses to IP addresses are not counted and are therefore decreased from the
total count because the IP address of any network is the network number, whereas the last IP address
is reserved for broadcast IP.
Let me repeat the sentence once again for you if you want.
You may note down because this is very important.
So here it goes.
While finding the total number of host IP addresses to IP addresses are not counted and are therefore
decreased from the total count because the IP address of any network is the network number, whereas
the last IP address is reserved for broadcast IP.
Now let us move on to the first class, which is class.
IP addresses belonging to Class E are assigned to the networks that contain a large number of hosts,
the network IP is eight bits long, whereas the horsehide is 24 bits long, the higher order with the
first update in class, it is always set to zero.
The remaining seven bits in the first octet are therefore used to determine network ID.
Therefore, the total number of network IDs is to rise to seven, which is equivalent to 128.
The 24 bits of horsehide are used to determine the host in any network.
The default subnet mask for Class E is fifty five point X indexed point X.
Now you may have a question.
What is a subnet mask?
Don't worry, we are going to talk about submitting and submitting mass after this little.
Not that zero point zero point zero point zero and one twenty seven point x y, there are special addresses,
as we have discussed a couple of minutes before.
The next is Glasby IP addresses belonging to Glasby are assigned to the networks that range from medium
sized to large sized networks.
The network, it is 16 minutes long and the horsehide is 16 minutes long.
Other bits of the first opted in.
Glasby is always set to one zero.
Therefore, there are 14 bits remaining which are used to determine the network ie the 16 bits of hostilely
are used to determine the host in any network.
The default subnet mask for Glassie is to fifty five point two fifty five point XPoint x.
Since 14 beds are used to determine the network idee, total number of network IDs is to rise to 14
and total number of hostages is to rise to 16 minus two while minus two.
We have already discussed in the previous slide.
The next one is Class C IP addresses belonging to Class C are assigned to small sized networks.
The network of Glassie is 24 minutes long and the host is eight minutes long.
Therefore, there are available hosts are two, it is two eight minus two, which is 256, minus two,
that is 254 hostiles are available for C.
The higher order bits of the first octet of IP address of Glassey are always said to one one zero.
The remaining 21 beds are used to determine that the eight bits of horsehide is used to determine the
host in any network.
Therefore, the default subnet mask for Glassie is two fifty five point two fifty five point two fifty
five point X.
The fourth glass is glass, the IP addresses belonging to glass be reserved for multicasting the higher
order bits of the first octet of IP address belonging to Gladdie and always set two one one one zero.
The remaining 28 bits are used to determine network idy the 28 bits of horsehide are used to determine
the host in any network.
Therefore, total number of network IDs is to this 228.
Finally moving to the last class that is Class E IP addresses belonging to Class E are reserved for
experimental and research purposes.
IP addresses of Class E range from 240 point of zero point zero point zero to two fifty five point two
fifty five point two fifty five point two fifty for this class doesn't have any subnet mask.
So if anyone asks you which class doesn't have any subnet mask, the obvious answer is class E, the
higher order bits of the first octet of Class E are always set to one one, one one.
So I hope you are clear with all the classes.
If you are not clear, you can always re watch the videos again.
So here's a quick recap, it's a quick table for the class full IP address.
So as you can see for the class e Nasdaq address is zero point zero point zero point zero two one twenty
seven point two fifty five point fifty five point fifty five.
In the same way, you have to remember this table.
And therefore you can see Glasby starts from 128 point zero point zero point zero.
Glassey starts from 192 point zero.
Class D starts from twenty four point zero.
So suppose someone gives you an example.
Let's say I like a random address, one twenty eight point fifty two point fifty six point one twenty
three.
So if anyone asks you to switch class, this address belongs.
You may see the first is the first octet is what we did.
So for sure, this IP address belongs to Class B in this way, just by looking at the numbers, you
can guess the class of IP address.