I noticed that I'm only getting resolved hostnames for hosts that have static DHCP leases on the display in Status > LAN > Active Clients. Like shown:
Is this normal, or is there any way to have it resolve the other host IPs? Local DNS servers are all defined and have reverse IP information. Feel like I'm overlooking something obvious. 
Well I noticed it in dd-wrt.v24-14311_NEWD-2_K2.6_big originally, but I'm running dd-wrt.v24-14473_NEWD-2_K2.6_big currently. I guess I'm assuming that hosts like this should go through reverse DNS (rDNS) lookup? Or would do hostnames only show for DHCP clients in dd-wrt... :/