Subnetting Questions 40 | Find the Subnet Mask with maximum Network and host

Subnetting Questions 40

What subnet mask would you use for the 172.29.0.0 network, such that you can get 590 subnets and 60 hosts per subnet?

Solution

Hence the IP Address starts from 172, it indicates it is a Class B Address. By default, in Class B Address 16 bits are reserved for the Network and 16 bits are reserved for the host.

A/Q we need minimum 590 Subnets. So we have to borrow 10 another bits for the network (2¹⁰ = 1024)

11111111 . 11111111 . 11111111 . 11000000

(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)

Therefore, the subnet mask is 255.255.255.192