A network administrator is configuring a subnet that needs to support 13 usable IP addresses. Which of the following subnet masks best meets this requirement?

The correct answer is D. 255.255.255.240. The subnet mask 255.255.255.240 corresponds to a /28 subnet. A /28 provides 16 total IP addresses, of which 14 are usable (excluding the network and broadcast addresses). Since the requirement is 13 usable IPs, this mask fits perfectly.

Submitted by femi9· Mar 6, 2026Network implementation

Question

Options

A255.255.255.128
B255.255.256.192
C255.285.256.224
D255.255.255.240

How the community answered

(53 responses)

A
6% (3)
B
4% (2)
C
11% (6)
D
79% (42)

Explanation

The subnet mask 255.255.255.240 corresponds to a /28 subnet. A /28 provides 16 total IP addresses, of which 14 are usable (excluding the network and broadcast addresses). Since the requirement is 13 usable IPs, this mask fits perfectly.

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