Determining appropriate DHCP range

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Given a LAN with default gateway of and subnet of The DHCP range is currently set in the range of to The 10.5.1.x range is reserved for static IP's. I want to increase the DHCP pool ( the 10.5.2.x - 10.5.3.x range is too small ) Is this DHCP scope limited to the 2.x and 3.x range because of the subnet? I cannot change the subnet in this scenario. When I try to add another range to the DHCP server ( i.e 10.5.4.x ) it will not allow it ( illegal range? ).... It's a Sonic Wall .. Model: PRO 300 (CPU: StrongARM / 233 Mhz) Firmware versio ()