D-Link DWR-966 User Manual page 38

LAN DHCP  DHCP Reservation
IP addresses can be reserved so that a particular IP address is always
allocated to a particular computer in the local network. This is achieved
by binding the unique hardware ID of the device, called the MAC
address, to an IP address in the DHCP server reserved IP address list.
List of Reserved IP Addresses:
MAC Address: The MAC address of the computer or local network
device.
IP Address: The reserved IP address to associate with the above MAC
address.
Click Add to add a reserved IP, or select an item and click Edit to modify
or click Delete to delete the selected item.
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