D-Link DI-804V Owner's Manual page 26

SYSTEM ADMINISTRATION
Here, remote users can be set up to configure and administrate the VPN
Internet Gateway through Internet. The default value of HTTP port is 80.
The default IP address of remote administration host is: 0.0.0.0. (IP address
of 0.0.0.0 means that any PC on the network can remote access and manage
the VPN Internet Gateway).
If you use this function, you have to enable the feature "Allow remote user to
configure the device" first. Once you have enabled this function, type the
VPN Internet Gateway WAN IP address (http://192.168.100.1:1023) into the
browser of any or specific PC on the network.
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