What Is the IP Address of a Router?

Sunday, December 21, 2008

A typical home network router possesses two IP addresses, one for the internal home (LAN) and one for the external Internet (WAN) connection. How can you find the router IP addresses?

he internal, LAN-IP address is normally set to a default, private number. Linksys routers, for example, use for their internal IP address. D-Link and Netgear routers typically use Some US Robotics routers use, and some SMC routers use No matter the brand of router, its default internal IP address should be provided in documentation. Administrators often have the option to change this IP address during router setup. In any case, however, the private LAN-IP address remains fixed once set. It can be viewed from the router's administrative console.

The external, WAN-IP address of the router is set when the router connects to the Internet service provider. This address can also be viewed on the router's administrative console. Alternatively, the WAN-IP address can be found by visiting a Web-based IP address lookup service like www.checkip.dyndns.org/ from any computer on the home LAN.

Another way to identify the public IP addresses of routers, involves executing a ping or "traceroute" command. From inside a home network, the (DOS) command "ping -r 1" will send a message through the home router that will cause its IP address to be displayed. For example, "ping -r 1 www.yahoo.com" should result in a message like the following displayed on the command prompt:

Reply from bytes=32 time=294ms TTL=56

In this example, the IP address after "Route:" ( corresponds to the router WAN address.

On corporate networks, network discovery services based on SNMP can automatically determine the IP addresses of routers and many other network devices.


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