IP address question:?

Question

A company is using an address range of 172.18.0.0/23. Which of the following are valid host addresses if the zero subnet is usable (choose three)

172.18.0.0
172.18.0.174
172.18.1.0
172.18.1.236
172.18.1.255
172.18.2.182

According to cisco, the answers are 172.18.0.174, 172.18.1.0, and 172.18.1.236, I don't know why 172.18.2.182 isn't part of an answer??

Answer 1

Because it is on a different network.