Subnetting Questions 11 | Find the subnet mask, Network and Host

Subnetting Questions 11

You are working with a network that has the network ID 192.168.10.0. What subnet should you use that supports up to 12 hosts and a maximum number of subnets?

Solution

Hence the IP Address starts from 192, it indicates it is a Class C Address. By default, in Class C Address 24 bits are reserved for the network and 8 bits are reserved for the host.

Let’s the count the number of hosts first.

A/Q we need the maximum number of subnets with minimum 12 host on each.

It means, we have to reserved 4 bits for the host.

(11111111.11111111.11111111.11110000)

The formula for calculating the number of hosts is

2ⁿ – 2 (n indicates the number of host bits and subtracted 2 because on every network first IP Address is reserved for the network ID and the last IP Address is reserved for the Broadcast ID)

= 2⁴ – 2

= 16 – 2

= 14 hosts on each subnet

Let’s count the number of Subnets.

As we have reserved 4 bits for the host. it means there are remaining 4 bits are available for the network.

The formula for counting the number of networks is

2ⁿ (n indicates the number of networks bits)

2⁴ = 16 (16 Subnets can be created)

Now, let’s find the subnet mask.

(11111111.11111111.11111111.11110000)

(2⁷ + 2⁶ + 2⁵ + 2⁴ + 2³ + 2² + 2¹ + 2⁰) . (2⁷ + 2⁶ + 2⁵ + 2⁴ + 2³ + 2² + 2¹ + 2⁰) . (2⁷ + 2⁶ + 2⁵ + 2⁴ + 2³ + 2² + 2¹ + 2⁰) . (2⁷ + 2⁶ + 2⁵ + 2⁴)

Therefore the subnet mask is 255.255.255.240

Class C Subnetting Tutorial

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