Subnetting Questions 39 | Find the subnet mask from CIDR Value

Subnetting Questions 39

What is the Subnet Mask corresponding to a shorthand of /25?

Find the subnet mask from the CIDR value /25

Solution

Hence, the CIDR value is /25 it means there are 25 network bits and all remaining 7 bits are the host.

11111111 . 11111111 . 11111111 . 10000000

(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)

Therefore, the Subnet Mask is 255.255.255.128