I'm putting on my CCNA hat once again and making yet another attempt at studying enough to actually pass this test. This morning I came across this question on subnettingquestions.com and I'm a little confused about my answer vs. their answer.

How many subnets and hosts per subnet can you get from the network 192.168.5.0/28?

My answer is 17 subnets (.0, .16, .32, .48, .64, .80, .96, .112, .128, .144, .160, .176, .192, .208, .224, .240, .256) and 14 hosts per subnet.
Their answer is 16 subnets and 14 hosts per subnet.

How did I get one additional subnet? Which one of mine doesn't belong? I'm assuming it's either the first or last one, but I'd like to know why that is.

Thanks in advance!

.256 is not a valid subnet. What would your host range be for it?

And there it is. Thank you!!!

192.168.5.0/28

I could get 2 /29s or
4 /30's, or 8 /31's

maybe I'm reading to deep into the question.

_________________
"If you're good at anticipating the human mind. It leaves nothing to chance."
-Jigsaw

You're right if you interpret what the OP said literally, but given he gave us the answer, we knew technically how he posited the question was incorrect. I imagine the original question was something like:

How many /28 hosts and subnets can you get out of 192.168.5.0 assuming classful boundaries?

or it would have been nice for them to just say:

How many /28 hosts and subnets can you get out of 192.168.5.0/24?