The D-Link DIR-400 is a wireless N router that provides fast and reliable internet connectivity for homes and small businesses. It features four LAN ports and one WAN port, allowing multiple devices to be connected simultaneously. The router also supports WPA/WPA2 encryption to ensure secure wireless communication. The DIR-400 is easy to set up and manage with its web-based user interface and can be used to create a wireless network or extend an existing one.

The DIR-400 is a router manufactured by the company D-Link that allows multiple devices to connect to a network and communicate with each other. It works by receiving data packets from devices and forwarding them to their intended destination. The router is assigned a unique IP address 192.168.0.1, which serves as its identifier on the network.

To access the router's settings and configure its functions, users can log in using a web browser and their admin and blank. Once logged in, users can customize various settings such as network name, password, and security protocols. They can also set up parental controls, prioritize bandwidth usage, and monitor network activity.