One WAN Connection, Multiple Static IP's

Hi,

In our office we have an Asus RT-N16 running Advanced Tomato (Based on Shibbys Tomato).

We have been given 5x Static IP's by our ISP, i have assigned one to the router with no problems. I'm wondering if its possible to assign another of the Static IP's to our server?

Currently this server just has an internal IP on the network (Windows Server 2012 R2)

Is this possible with Tomato?

Thanks for any advice.