Subnetting Questions 31 | Find the CIDR value from the subnet Mask

Subnetting Questions 31

What is the shorthand corresponding to a subnet mask of 255.255.224.0?

or

Find the CIDR value from the Subnet Mask 255.255.224.0?

Solution

255.255.224.0

11111111 . 11111111 . 11100000 . 00000000

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

Hence, there is 19 Network bits. So the CIDR Value for the subnet mask 255.255.224.0 is /19.