Block of 8 IP, Can only use 4

Hi all, I've just order a block of 8 more IP's for my server however The reply is as follows
* Number of IPs: 8
* Network: *.*.*.168
* Gateway: *.*.*.169
* Netmask: 255.255.255.248
* Broadcast: *.*.*.175
* First usable: *.*.*.170
* Last usable: *.*.*.174

Why can I only use *.170 - *.174

 

 

 

 

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