D-Link DIR-505 User Manual page 51

Section 3 - Router Mode
DHCP.Reservation
If you want a computer or device to always have the same IP address
assigned, you can create a DHCP reservation. The router will assign the IP
address only to that computer or device.
Note: This IP address must be within the DHCP IP Address Range.
Enable: Check this box to enable the reservation.
Computer Enter a name for your computer. You can also use the
Name: dropdown box to the right to select a currently connected
computer, and then click the << button to automatically fill
in the text boxes with your computer's information.
IP Address: Enter the IP address you want to assign to the computer or
device. This IP Address must be within the DHCP.IP.Address.
Range.
MAC Address: Enter the MAC address of the computer or device.
Clone Your You can click this button to automatically add the MAC
PC's MAC address of the computer that you are currently using.
Address:
Save: Click Save to save your DHCP reservation. You will still need
to click Save.Settings at the top of the screen to activate your
DHCP reservations.
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