@ronwbrown:
I don't want to bridge the entire WAN, just one of the IP addresses.. I don't know how, or if it is even possible
I actually have 3 subnets
x.x.x.32/29 (1 gateway 5 usable)
x.x.x.72/29 (1 gateway 5 usable)
x.x.x.80.28 (1 gateway 13 usable)
I want to assign x.x.x.35 to server on lan going thru pfsense
You can break the x.x.x.32/29 into two /30 subnets, then assign the second of them to the LAN or DMZ interface of pfSense.
ISP x.x.x.33 –--- x.x.x.34/30 pfSense x.x.x.37/30 ----- x.x.x.38/30 Server
Now, since the ISP still believes that his router shares L2 segment with the whole x.x.x.32/29 subnet, you have to trick him using ProxyARP VIP x.x.x.38/32 on the WAN of pfSense that will make the server reachable from the Internet.