Question about IP addresses

I requested two additional IP addresses from my host and this is the response they gave:

"xxx.168.118.188/30 which should give you 2-4 depending on os"

I 'xxx' the first 3 numbers, but I dont get this. At first I thought the IP's were:
xxx.168.118.188 and
xxx.168.118.30 but they dont work after adding them to my network interface, am I missing something obvious here?

And what does '2-4 depending on operating system' mean?

 

 

 

 

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