D-Link DWR-923 User Manual page 30

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 allows
devices such as printers and VoIP phones to be assigned the same IP
address from the DHCP server when they come online, which is critical
for hostname mapping and port mapping rules. 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 Address:
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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