Yea, I only set the number of IP's I need.

Something I have been using a lot of lately is Broadband over Powerline.
I plug it into the wall behind the router, plug a wire from the router
to the BPL and then in 1 or 10 other rooms where I need access, you
simple plug it in and you have either wired or wireless access in that
room.

I set this up recently in a cinderblock building with lots of metal
partition walls. They needed to use encryption and they were using
laptops so, we installed wireless bpl units which allowed them to run
WPA without dropping off their range or speed.