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Subnetting: Accommodate more than 225 hosts

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Hi,

I have a subnetting question. First I’ll give an example:

An organization has the IP 200.1.1.0 and needs 4 subnets with the following characteristics:

Subnet A =>72 hosts

Subnet B => 35 hosts

Subnet C => 20 hosts

Subnet D => 18 hosts

Provide the IPs per subnet.


Solution

Subnet A =72 host

For 72 hosts we need 2^7 - 2 = 128 - 2 = 126 host. We need 7 bits for the hosts.

Network => 200.1.1.0/25

Mask => 255.255.255.128

First Host => 200.1.1.1/25

Last Host => 200.1.1.126/25

Broadcast => 200.1.1.127/25



Subnet B =35 host

For 72 hosts we need 2^6 - 2 = 64 - 2 = 62 host. We need 6 bits for the hosts.

Network => 200.1.1.128/25

Mask => 255.255.255.192

First Host => 200.1.1.129/26

Last Host => 200.1.1.190/26

Broadcast => 200.1.1.191/26



Subnet C =72 host

For 72 hosts we need 2^5 - 2 = 32 - 2 = 30 host. We need 5 bits for the hosts.

Network => 200.1.1.192/27

Mask => 255.255.255.224

First Host => 200.1.1.193/27

Last Host => 200.1.1.222/27

Broadcast => 200.1.1.223/27



Subnet D =72 host

For 72 hosts we need 2^5 - 2 = 32 - 2 = 30 host. We need 5 bits for the hosts.

Network => 200.1.1.224/27

Mask => 255.255.255.224

First Host => 200.1.1.225/27

Last Host => 200.1.1.254/27

Broadcast => 200.1.1.255/27



So, according the above solution, how do we create subnets for the IP 155.52.48.0/23 with the following characteristics (provide Network, Mask First Host, Last Host and Broadcast IPs foe each subnet)?

Subnet A =>200 hosts

Subnet B => 100 hosts

Subnet C => 40 hosts

Subnet D => 40 hosts



I’m really stuck with that.

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