This web site is a free tool to help you find your router's administration web
You might want to do that in order to set up wireless (802.11/Wi-Fi)
access, configure forwarding rules, upgrade firmware, or set security features.
Depending on your configuration and router model, it may be using one of many
possible Internet (IP) addresses and port numbers. This web page uses Java to find the
IP address of your router and to determine the port number.