Subnetting Questions 28 | Find the first valid host on the network

Subnetting Questions 28

Enter the first valid host on the network 10.209.0.0 with the subnet mask 255.255.0.0:

Solution

Hence, the IP Address starts from 10 it indicates it is a Class A Address. By default, in Class A address 8 bits are reserved for the network and 24 bits are reserved for the host.

The Subnet Mask is 255.255.0.0, means we have to borrow another 8 bits from the second octet.

11111111 . 11111111 . 00000000 . 00000000

(2⁷ + 2⁶ + 2⁵ + 2⁴ + 2³ + 2² + 2¹ + 2⁰) . (2⁷ + 2⁶ + 2⁵ + 2⁴ + 2³ + 2² + 2¹ + 2⁰) . 0 . 0

255.255.0.0

Let’s count the number of subnets

2ⁿ (Here, n indicates the total number of network bits borrowed)

2⁸ = 256 Subnets are available.

Let’s count the number of IP Address on each network

2ⁿ (Here, n indicates the total number of host bits)

2¹⁶ = 65536 IP Address is available on each network

List of top 5 subnets (Network)

Hence the IP Address 10.209.0.0 falls under the first network. Its first host is 10.209.0.1